Style fix.

spec/README.md

@@ -77,7 +77,7 @@ but sorely lacking in the vast majority of them.
 ### Why not CGI?
 
 * CGI is also **rigid** about how it matches HTTP and UNIX® process
-  concepts.  Notably CGI *meta-variables* are injected into the script's
+  concepts.  Notably, CGI *meta-variables* are injected into the script's
   environment; this behavior can and has been exploited by nasty attacks such as
   [Shellshock](https://en.wikipedia.org/wiki/Shellshock_(software_bug)).
 * Trying to leverage CGI from a shell script could be less cumbersome in some