(Reformattable Text (text/x-kom-basic)): Removed duplicated "as".

doc/Protocol-A.texi

@@ -8777,7 +8777,7 @@ that name.  Please use the new name @samp{text/x-kom-basic} instead.
 
 Historical note: version 0.46.1 and earlier of the elisp client
 created texts labeled with @samp{x-kom/text}.  Clients may treat that content
-type as as @samp{text/x-kom-basic} for improved interoperability.
+type as @samp{text/x-kom-basic} for improved interoperability.
 
 @node The User Area (x-kom/user-area)
 @section The User Area