/*
* Compute the exact path an alternate is at and returns it. In case of
* error NULL is returned and the human readable error is added to `err`
- * `path` may be relative and should point to $GITDIR.
+ * `path` may be relative and should point to $GIT_DIR.
* `err` must not be null.
*/
char *compute_alternate_path(const char *path, struct strbuf *err)