Write command for querying community pool balance correctly (#4786)

## Describe your changes
An example command in the documentation says `Community Pool` instead of
`community-pool`.

## Issue ticket number and link
N/A

## Checklist before requesting a review

- [X] If this code contains consensus-breaking changes, I have added the
"consensus-breaking" label. Otherwise, I declare my belief that there
are not consensus-breaking changes, for the following reason:

  > documentation-only change

Signed-off-by: Smitty <[email protected]>

docs/protocol/src/community_pool.md

@@ -22,7 +22,7 @@ To query the current Community Pool balance, use `pcli query community-pool bala
 asset or its asset ID (display denominations are not currently accepted). For example:
 
 ```bash
-pcli query Community Pool balance upenumbra
+pcli query community-pool balance upenumbra
 ```
 
 Community Pool spend proposals are only accepted for voting if they would not overdraw the current funds in the