docs: Fix two typos

llvm-svn: 143565
diff --git a/llvm/docs/HowToAddABuilder.html b/llvm/docs/HowToAddABuilder.html
index 62cb85b..4fc7188 100644
--- a/llvm/docs/HowToAddABuilder.html
+++ b/llvm/docs/HowToAddABuilder.html
@@ -33,8 +33,8 @@
 <!-- *********************************************************************** -->
 <div>
 
-<p>Volunters can provade there build machines to work as slave builders to 
-   public LLVM Buildbot. Below desrcibed recommended steps to implement this 
+<p>Volunters can provide there build machines to work as slave builders to
+   public LLVM Buildbot. Below described recommended steps to implement this
    task.</p>
 
 <p>The steps are roughly as follows:</p>