fix 1 unicode

Author: Yashp002

Doc/c-api/unicode.rst

@@ -132,14 +132,16 @@ access to internal read-only data of Unicode objects:
 .. c:macro:: PyUnicode_IS_COMPACT(o)
 
    Return true if the Unicode object *o* is a compact string.
-
+   Compact strings use a single memory block for
+   the structure and the character data.
    .. versionadded:: 3.3
 
 
 .. c:macro:: PyUnicode_IS_COMPACT_ASCII(o)
 
    Return true if the Unicode object *o* is a compact ASCII string.
-
+   A compact ASCII string uses a single memory block
+   and contains only ASCII characters.
    .. versionadded:: 3.3