dpkg-query(1): Clarify that several fields are not dselect specific

These apply to most dpkg front-ends not just dselect.

debian/changelog

@@ -125,6 +125,8 @@ dpkg (1.16.1) UNRELEASED; urgency=low
     - Add missing built-in methods to dselect(1).
     - Add missing escaping to field dashes in deb-control(5).
     - Use dashes instead of underscores for variable text.
+    - Clarify that several front-end fields are not dselect specific in
+      dpkg-query(1).
 
   [ Bill Allombert]
   * Add support for Build-Features: build-arch. Closes: #229357

man/dpkg-query.1

@@ -156,11 +156,11 @@ fields or fields stored in the binary package end up in it):
     \fBDescription\fP
     \fBEnhances\fP
     \fBEssential\fP
-    \fBFilename\fP (internal, dselect related)
+    \fBFilename\fP (internal, front-end related)
     \fBHomepage\fP
     \fBInstalled\-Size\fP
-    \fBMD5sum\fP (internal, dselect related)
-    \fBMSDOS\-Filename\fP (internal, dselect related)
+    \fBMD5sum\fP (internal, front-end related)
+    \fBMSDOS\-Filename\fP (internal, front-end related)
     \fBMaintainer\fP
     \fBOrigin\fP
     \fBPackage\fP
@@ -171,7 +171,7 @@ fields or fields stored in the binary package end up in it):
     \fBReplaces\fP
     \fBRevision\fP (obsolete)
     \fBSection\fP
-    \fBSize\fP (internal, dselect related)
+    \fBSize\fP (internal, front-end related)
     \fBSource\fP
     \fBStatus\fP (internal)
     \fBSuggests\fP