Remove repetition of string escapes note 1 at end of note 2.

Doc/reference/lexical_analysis.rst

@@ -529,8 +529,7 @@ Notes:
 (2)
    Any Unicode character can be encoded this way, but characters outside the Basic
    Multilingual Plane (BMP) will be encoded using a surrogate pair if Python is
-   compiled to use 16-bit code units (the default).  Individual code units which
-   form parts of a surrogate pair can be encoded using this escape sequence.
+   compiled to use 16-bit code units (the default).
 
 (3)
    As in Standard C, up to three octal digits are accepted.