Small syntax fix in an example

doc/plugin.txt

@@ -377,7 +377,7 @@ options_identities_table
    holds each identity.  The arguments to this hook are:
 
       [0] = color of table (use it like this in your plugin:
-               <tr bgcolor="<?PHP echo $info[1]?>">
+               <tr bgcolor="<?php echo $info[1]; ?>">
       [1] = is this an empty section (the one at the end of the list)?
       [2] = what is the 'post' value? (ident # or empty string if default)