Fix path from XSpec to XSLT

Also fix a minor grammatical issue in a label.

src/testing/issue_235_regression.xspec

@@ -2,9 +2,9 @@
 <x:description 
     xmlns:x="http://www.jenitennison.com/xslt/xspec"
     xmlns:mv="http://g"
-    stylesheet="../converter-gen/supermodel-to-json.xsl">
+    stylesheet="../converter-gen/xml-to-json/supermodel-to-json.xsl">
     <x:scenario label="Regression Test for usnistgov/metaschema#235">
-        <x:scenario label="If a document instance has a field has no value or flag defined">
+        <x:scenario label="If a document instance has a field with no value or flag defined">
             <x:context  mode="write-json">
                 <!--
                     <root xmlns="http://csrc.nist.gov/ns/metaschema/unit-tests">