[Completion] Remove unused DocWords

The various keyword/recommended/etc fields were parsed and added to
completions, but never actually plumbed through SourceKit. Since they're
still unused and the implementation is not particularly lightweight,
just remove for now.

Resolves rdar://82464220

tools/SourceKit/lib/SwiftLang/CodeCompletionOrganizer.cpp

@@ -1172,8 +1172,7 @@ Completion *CompletionBuilder::finish() {
           current.getModuleName(), current.getSourceFilePath(),
           current.getNotRecommendedReason(), current.getDiagnosticSeverity(),
           current.getDiagnosticMessage(), current.getBriefDocComment(),
-          current.getAssociatedUSRs(), current.getDeclKeywords(),
-          typeRelation, opKind);
+          current.getAssociatedUSRs(), typeRelation, opKind);
     } else {
       base = SwiftResult(current.getKind(), semanticContext, flair,
                          current.getNumBytesToErase(), completionString,