Update docs/html/topics/vcs-support.md

Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>

docs/html/topics/vcs-support.md

@@ -141,7 +141,7 @@ Python package, when it is not in the root of the VCS directory. eg: `pkg_dir`.
 
 pip also looks at the `egg` fragment specifying the "project name". In practice the
 `egg` fragment is only required to help pip determine the VCS clone location in editable
-mode. In all other circumstance the `egg` fragment is not necessary and its use is
+mode. In all other circumstances, the `egg` fragment is not necessary and its use is
 discouraged.
 
 ````{admonition} Example