Fix some typos

Patch by Noorul Islam.

README

@@ -27,8 +27,8 @@ xemacs/
     does not work under XEmacs without this file installed.  It did
     until version 4.37, but no longer.
 
-CONTRIB/
-    A diretory with third-party additions for Org.  Some really cool
+contrib/
+    A directory with third-party additions for Org.  Some really cool
     stuff is in there.
 
 ORGWEBPAGE/

README_DIST

@@ -23,8 +23,8 @@ xemacs/
     does not work under XEmacs without this file installed.  It did
     until version 4.37, but no longer.
 
-CONTRIB/
-    A diretory with third-party additions for Org.  Some really cool
+contrib/
+    A directory with third-party additions for Org.  Some really cool
     stuff is in there.
 
 ChangeLog

doc/Documentation_Standards.org

@@ -3,7 +3,7 @@
 #+EMAIL:    phil@yax.org.uk
 #+LANGUAGE: en
 #+STARTUP:  showall
-#+TEXT:     Notes to myself justifying the coventions and standards in my
+#+TEXT:     Notes to myself justifying the conventions and standards in my
 #+TEXT:     set of recent doc patches.
 #+OPTIONS:  H:3 num:t toc:t \n:nil @:t ::t |:t ^:t *:t TeX:t