Remove trailing space

Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>

Author: jonathandung

Doc/library/json.rst

@@ -212,7 +212,7 @@ Basic Usage
       If zero, negative, or ``""`` (the empty string),
       only newlines are inserted.
       If ``None`` (the default), no pretty printing is done, and a
-      compact representation is used, though a singular space is 
+      compact representation is used, though a singular space is
       still left after the separators.
    :type indent: int | str | None