Checks if a given 'refname' is acceptable, and exits with a non-zero
status if it is not.
-A reference is used in git to specify branches and tags. A
+A reference is used in Git to specify branches and tags. A
branch head is stored in the `refs/heads` hierarchy, while
a tag is stored in the `refs/tags` hierarchy of the ref namespace
(typically in `$GIT_DIR/refs/heads` and `$GIT_DIR/refs/tags`
directories or, as entries in file `$GIT_DIR/packed-refs`
if refs are packed by `git gc`).
-git imposes the following rules on how references are named:
+Git imposes the following rules on how references are named:
. They can include slash `/` for hierarchical (directory)
grouping, but no slash-separated component can begin with a