#186 Doc Change RexxRef: Minor Typos

[Erich]

The attached patch fixes three minor typos in Rexx Reference.

collclasses.xml
"Sorts a a collection of Comparable items" -> "Sorts a collection .."
"Returns a Array-supplied index for item" -> "Returns an Array.."

iostrms.xml
"or the COMMAND method's SEEK or POSITIONstream_command" ->" ".. POSITION stream_command"

[Rick McGuire]

Committed [r9696], 4.2.0 branch