docs: fix a few typos

Noticed a couple, found the rest using vimspell.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/codingstyle.html b/docs/codingstyle.html
index e5a92b0..7e9f470 100644
--- a/docs/codingstyle.html
+++ b/docs/codingstyle.html
@@ -120,7 +120,7 @@
    _mesa_foo_bar()  - an internal non-static Mesa function
 </pre>
 
-<li>Constants, macros and enumerant names are ALL_UPPERCASE, with _ between
+<li>Constants, macros and enum names are ALL_UPPERCASE, with _ between
 words.
 <li>Mesa usually uses camel case for local variables (Ex: "localVarname")
 while gallium typically uses underscores (Ex: "local_var_name").