docs: Fix minor typos.

dbec3a5d introduced minor typos, this should fix them.

Signed-off-by: Kai Wasserbäch <kai@dev.carbon-project.org>
Signed-off-by: Brian Paul <brianp@vmware.com>
diff --git a/docs/devinfo.html b/docs/devinfo.html
index d9e82e2..678e48c 100644
--- a/docs/devinfo.html
+++ b/docs/devinfo.html
@@ -142,9 +142,9 @@
 of <tt>bool</tt>, <tt>true</tt>, and
 <tt>false</tt> over <tt>GLboolean</tt>, <tt>GL_TRUE</tt>, and
 <tt>GL_FALSE</tt>.  In C code, this may mean that
-<tt>#include &lt;stdbool.h&gt;</tt> need to be added.  The
+<tt>#include &lt;stdbool.h&gt;</tt> needs to be added.  The
 <tt>try_emit_</tt>* methods in src/mesa/program/ir_to_mesa.cpp and
-src/mesa/state_tracker/st_glsl_to_tgsi.cpp can serve as an example.
+src/mesa/state_tracker/st_glsl_to_tgsi.cpp can serve as examples.
 </p>