Fix docs typo (yugabyte#231)

doc/pgtap.mmd

@@ -1644,7 +1644,7 @@ bare `RECORD` value may be passed:
 
     SELECT row_eq( $$ SELECT 1, 'foo' $$, ROW(1, 'foo') );
 
-ue to the limitations of non-C functions in earlier versions of PostgreSQL, a
+Due to the limitations of non-C functions in earlier versions of PostgreSQL, a
 bare `RECORD` value cannot be passed to the function. You must instead pass in a
 valid composite type value, and cast the record argument (the second argument)
 to the same type. Both explicitly created composite types and table types are