Update src/naming.adoc

Signed-off-by: Kersten Richter <[email protected]>

Author: kersten1

src/naming.adoc

@@ -117,7 +117,7 @@ Non-standard extensions are named by using a single "X" followed by the alphanum
 name. The name must end with an alphabetic character. The 
 second letter from the end cannot be numeric if the last letter is 
 "p". For example, "Xhwacha" names the Hwacha vector-fetch ISA 
-extension;
+extension.
 
 Non-standard extensions must be listed after all standard extensions, and,
 like other multi-letter extensions, must be separated from other multi-letter