Minor doc polish.

README.rst

@@ -758,8 +758,8 @@ If ``all`` is ``false``, then return the result of replacing the first
 portion of ``str`` that matches the regex with ``sub``. ``sub`` may
 contain backreferences ``\0`` through ``\9``, to include captured
 substrings from ``str`` in the substitution. This is the same
-operation performed by the native VCL function ``regsub(str, regex,
-sub)`` (see vcl(7)). By default, ``all`` is false.
+operation performed by the native VCL function
+``regsub(str, regex, sub)`` (see vcl(7)). By default, ``all`` is false.
 
 If ``all`` is ``true``, return the result of replacing each
 non-overlapping portion of ``str`` that matches the regex with ``sub``