docs: add more more code-tags

It's easier to read function-names, file-names and other
"machine"-related strings if they are formatted in a monospace font. So
let's mark these up with code-tags.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
diff --git a/docs/codingstyle.html b/docs/codingstyle.html
index e8832e7..aa1e09c 100644
--- a/docs/codingstyle.html
+++ b/docs/codingstyle.html
@@ -120,10 +120,11 @@
    _mesa_foo_bar()  - an internal non-static Mesa function
 </pre>
 
-<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").
+<li>Constants, macros and enum names are <code>ALL_UPPERCASE</code>, with _
+between words.
+<li>Mesa usually uses camel case for local variables (Ex:
+<code>localVarname</code>) while gallium typically uses underscores (Ex:
+<code>local_var_name</code>).
 <li>Global variables are almost never used because Mesa should be thread-safe.
 
 <li>Booleans.  Places that are not directly visible to the GL API
@@ -131,8 +132,9 @@
 <code>false</code> over <code>GLboolean</code>, <code>GL_TRUE</code>, and
 <code>GL_FALSE</code>.  In C code, this may mean that
 <code>#include &lt;stdbool.h&gt;</code> needs to be added.  The
-<code>try_emit_</code>* methods in src/mesa/program/ir_to_mesa.cpp and
-src/mesa/state_tracker/st_glsl_to_tgsi.cpp can serve as examples.
+<code>try_emit_</code>* methods in <code>src/mesa/program/ir_to_mesa.cpp</code>
+and <code>src/mesa/state_tracker/st_glsl_to_tgsi.cpp</code> can serve as
+examples.
 
 </ul>