git-stage: convert to alias page (#10942)

* git-stage: 'synonym' -> 'alias'

* git-stage: convert to alias page

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

---------

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/git-stage.md

@@ -1,33 +1,8 @@
 # git stage
 
-> Add file contents to the staging area.
-> Synonym of `git add`.
+> This command is an alias of `git add`.
 > More information: <https://git-scm.com/docs/git-stage>.
 
-- Add a file to the index:
+- View documentation for the original command:
 
-`git stage {{path/to/file}}`
-
-- Add all files (tracked and untracked):
-
-`git stage -A`
-
-- Only add already tracked files:
-
-`git stage -u`
-
-- Also add ignored files:
-
-`git stage -f`
-
-- Interactively stage parts of files:
-
-`git stage -p`
-
-- Interactively stage parts of a given file:
-
-`git stage -p {{path/to/file}}`
-
-- Interactively stage a file:
-
-`git stage -i`
+`tldr git-add`