Given one argument, reads which branch head the given symbolic
ref refers to and outputs its path, relative to the `.git/`
directory. Typically you would give `HEAD` as the <name>
-argument to see on which branch your working tree is on.
+argument to see which branch your working tree is on.
-Give two arguments, create or update a symbolic ref <name> to
+Given two arguments, creates or updates a symbolic ref <name> to
point at the given branch <ref>.
A symbolic ref is a regular file that stores a string that