Shorten description

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Author: jonathandung

Doc/library/json.rst

@@ -211,9 +211,7 @@ Basic Usage
       a string (such as ``"\t"``) is used to indent each level.
       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
-      still left after the separators.
+      If ``None`` (the default), no newlines are inserted.
    :type indent: int | str | None
 
    :param separators: