Fix incorrect spelling of retrieve from retreive

Corrected the spelling of retrieve, where it was spelled as retreive.

 - There were two cases of this mispelling; one
   upper-case and one lower-case

Change-Id: Ic97fd210d8d3ae7e568e5a2e5d97c6220d2ff628
Signed-off-by: Richard B Winters <rik@mmogp.com>
Reviewed-by: Steven Dake <sdake@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

man/cmap_get.3.in

@@ -35,7 +35,7 @@
 
 .SH NAME
 .P
-cmap_get \- Retreive value from CMAP
+cmap_get \- Retrieve value from CMAP
 
 .SH SYNOPSIS
 .P
@@ -74,7 +74,7 @@ Also shortcuts for different types are defined
 .P
 The
 .B cmap_get
-function is used to retreive key from cmap previously set by
+function is used to retrieve key from cmap previously set by
 .B cmap_set(3)
 function. The
 .I handle