Fix a typo

README.rst

@@ -837,7 +837,7 @@ sequences can be used to insert strings:
 ``$$``
   Inserts a dollar character.
 
-``$<n>`` of ``${<n>}``
+``$<n>`` or ``${<n>}``
   Inserts the contents of group ``<n>`` captured during the match,
   where ``<n>`` can be a number or a name. The number can be 0 to
   include the entire matched string. Braces are only required if the

src/vmod_pcre2.vcc

@@ -794,7 +794,7 @@ sequences can be used to insert strings:
 ``$$``
   Inserts a dollar character.
 
-``$<n>`` of ``${<n>}``
+``$<n>`` or ``${<n>}``
   Inserts the contents of group ``<n>`` captured during the match,
   where ``<n>`` can be a number or a name. The number can be 0 to
   include the entire matched string. Braces are only required if the