git-add: fix --force example (#20885)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/common/git-add.md

@@ -3,7 +3,7 @@
 > Adds changed files to the index.
 > More information: <https://git-scm.com/docs/git-add>.
 
-- Add a file to the index:
+- Stage a file for a commit:
 
 `git add {{path/to/file}}`
 
@@ -19,9 +19,9 @@
 
 `git add {{[-u|--update]}}`
 
-- Also add ignored files:
+- Add an ignored file:
 
-`git add {{[-f|--force]}}`
+`git add {{[-f|--force]}} {{path/to/file}}`
 
 - Interactively stage parts of files: