Added and linked to subheader "String escape sequences"

This commit addresses issue python#103360 by adding a subsection header "String escape sequences" above the escape sequences table in lexical_analysis.rst, and referencing that subsection header in stdtypes.rst where the documentation mentions supported escape sequences under "Text Sequence Type - str".
juswil · Apr 20, 2023 · 89f2eb3 · 89f2eb3
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diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
@@ -1491,7 +1491,7 @@ 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`

diff --git a/Doc/reference/lexical_analysis.rst b/Doc/reference/lexical_analysis.rst
@@ -545,6 +545,9 @@ retained), except that three unescaped quotes in a row terminate the literal.  (
 
 .. _escape-sequences:
 
+String escape sequences
+-------------------------
+
 Unless an ``'r'`` or ``'R'`` prefix is present, escape sequences in string and
 bytes literals are interpreted according to rules similar to those used by
 Standard C.  The recognized escape sequences are: