Update README.rst

Author: yuin

README.rst

@@ -830,7 +830,7 @@ Miscellaneous notes
 - ``file:setvbuf`` does not support a line buffering.
 - Daylight saving time is not supported.
 - GopherLua has a function to set an environment variable : ``os.setenv(name, value)``
-- GopherLua support `goto` and `::label::` statement in Lua5.2.
+- GopherLua support ``goto`` and ``::label::`` statement in Lua5.2.
   - `goto` is a keyword and not a valid variable name.
 
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