docs: fix html end/start tags

for more well-formed html

Signed-off-by: Brian Paul <brianp@vmware.com>
diff --git a/docs/shading.html b/docs/shading.html
index 604bd1d..ebb3927 100644
--- a/docs/shading.html
+++ b/docs/shading.html
@@ -152,7 +152,7 @@
 
 <p>
 This tool is useful for:
-<p>
+</p>
 <ul>
 <li>Inspecting GPU code to gain insight into compilation
 <li>Generating initial GPU code for subsequent hand-tuning
@@ -241,8 +241,7 @@
 <br>
 If set, instructions will be annoted with comments to help with debugging.
 Extra NOP instructions will also be inserted.
-</br>
-
+</li>
 </ul>