add initial spelling wordlist

Author: jmckenna

en/MIGRATION_GUIDE.txt

@@ -1070,7 +1070,7 @@ for EPSG codes between 4000 and 5000.
 Change of mime-type for the imagemap outputformat
 -------------------------------------------------
 
-RFC 36 added support for templated outptformats, but this new feature
+RFC 36 added support for templated outputformats, but this new feature
 was not available for WMS GetFeatureInfo output (see ticket #3024). 
 In MapServer 5.6 this has been resolved by implementing lookup of output 
 formats for query templates by mime-type. However this caused a conflict