[commands/cache] Minor clean-up.

- Consistently use singular 'cache' (not plural 'caches').
- Remove unnecessary uses of the word 'currently'.
- Use 'file(s)' instead of 'files', to account for case of only one file.
- Use .format() when appropriate.
- Minor cleanup of `pip cache`-related files in docs/.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/html/reference/pip_cache.rst b/docs/html/reference/pip_cache.rst
index d56d1b016..8ad99f65c 100644
--- a/docs/html/reference/pip_cache.rst
+++ b/docs/html/reference/pip_cache.rst
@@ -2,7 +2,7 @@
 .. _`pip cache`:
 
 pip cache
-------------
+---------
 
 .. contents::