Trac #22000: The coding conventions for INPUT: blocks have periods

There should not be periods on the `INPUT:` blocks as they are not
complete sentences and the majority of documentation does not include
them.

URL: https://trac.sagemath.org/22000
Reported by: tscrim
Ticket author(s): Travis Scrimshaw
Reviewer(s): Paul Masson

Author: Release Manager

src/doc/en/developer/coding_basics.rst

@@ -256,7 +256,7 @@ information. You can use the existing functions of Sage as templates.
 
        INPUT:
 
-       - ``p`` -- (default: 2) a positive prime integer.
+       - ``p`` -- (default: 2) a positive prime integer
 
        OUTPUT: