git status now proposes git restore

rather than `git checkout --` for discarding changes in working directory.

Change made using:
	git sed '(use "git checkout -- <file>\.\.\." to discard changes in working directory)' '(use "git restore <file>..." to discard changes in working directory)'
but manually checked that all matches are about `git status` outputs
or about outputs of commands that also have this change, namely:
 * `git stash apply`
 * `git stash branch <new branch name>`

Author: das-g

book/02-git-basics/sections/recording-changes.asc

@@ -114,7 +114,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 
@@ -159,7 +159,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 
@@ -299,7 +299,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 ----
@@ -363,7 +363,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 ----
@@ -497,7 +497,7 @@ On branch master
 Your branch is up-to-date with 'origin/master'.
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 
@@ -528,7 +528,7 @@ On branch master
 Your branch is up-to-date with 'origin/master'.
 Changes not staged for commit:
   (use "git add/rm <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
         deleted:    PROJECTS.md
 

book/02-git-basics/sections/undoing.asc

@@ -84,7 +84,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 ----
@@ -112,7 +112,7 @@ In the last example output, the unstaged area looks like this:
 ----
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
     modified:   CONTRIBUTING.md
 ----

book/07-git-tools/sections/stashing-cleaning.asc

@@ -32,7 +32,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
 	modified:   lib/simplegit.rb
 ----
@@ -80,7 +80,7 @@ $ git stash apply
 On branch master
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
 	modified:   index.html
 	modified:   lib/simplegit.rb
@@ -109,7 +109,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
 	modified:   lib/simplegit.rb
 ----
@@ -214,7 +214,7 @@ Changes to be committed:
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
 	modified:   lib/simplegit.rb
 

book/07-git-tools/sections/submodules.asc

@@ -293,7 +293,7 @@ Your branch is up-to-date with 'origin/master'.
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
   modified:   .gitmodules
   modified:   DbConnector (new commits)
@@ -313,7 +313,7 @@ Your branch is up-to-date with 'origin/master'.
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
 	modified:   .gitmodules
 	modified:   DbConnector (new commits)
@@ -400,7 +400,7 @@ $ git status
 Your branch is up-to-date with 'origin/master'.
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
-  (use "git checkout -- <file>..." to discard changes in working directory)
+  (use "git restore <file>..." to discard changes in working directory)
 
 	modified:   DbConnector (new commits)