Merge branch 'jk/credential-sample-update'

The samples in the credential documentation has been updated to
make it clear that we depict what would appear in the .git/config
file, by adding appropriate quotes as needed..

* jk/credential-sample-update:
  gitcredentials(7): make shell-snippet example more realistic
  gitcredentials(7): clarify quoting of helper examples

Documentation/gitcredentials.txt

@@ -216,20 +216,26 @@ Here are some example specifications:
 
 ----------------------------------------------------
 # run "git credential-foo"
-foo
+[credential]
+	helper = foo
 
 # same as above, but pass an argument to the helper
-foo --bar=baz
+[credential]
+	helper = "foo --bar=baz"
 
 # the arguments are parsed by the shell, so use shell
 # quoting if necessary
-foo --bar="whitespace arg"
+[credential]
+	helper = "foo --bar='whitespace arg'"
 
 # you can also use an absolute path, which will not use the git wrapper
-/path/to/my/helper --with-arguments
+[credential]
+	helper = "/path/to/my/helper --with-arguments"
 
 # or you can specify your own shell snippet
-!f() { echo "password=`cat $HOME/.secret`"; }; f
+[credential "https://example.com"]
+	username = your_user
+	helper = "!f() { test \"$1\" = get && echo \"password=$(cat $HOME/.secret)\"; }; f"
 ----------------------------------------------------
 
 Generally speaking, rule (3) above is the simplest for users to specify.