pythongh-103360: Add link in stdtypes.rst to escape sequences in lexical_analysis.rst (pythonGH-103638)

Author: juswil

Doc/library/stdtypes.rst

@@ -1528,7 +1528,7 @@ between them will be implicitly converted to a single string literal. That
 is, ``("spam " "eggs") == "spam eggs"``.
 
 See :ref:`strings` for more about the various forms of string literal,
-including supported escape sequences, and the ``r`` ("raw") prefix that
+including supported :ref:`escape sequences <escape-sequences>`, and the ``r`` ("raw") prefix that
 disables most escape sequence processing.
 
 Strings may also be created from other objects using the :class:`str`