tests/qapi-schema: Fix feature documentation testing

Commit 8aa3a33e44 "tests/qapi-schema: Test for good feature lists in
structs" made test-qapi.py show features, but neglected to show their
documentation.  Fix that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20191024110237.30963-5-armbru@redhat.com>

tests/qapi-schema/doc-bad-feature.out

@@ -15,3 +15,5 @@ command foo None -> None
 doc symbol=foo
     body=
 
+    feature=a
+a

tests/qapi-schema/doc-good.out

@@ -126,6 +126,8 @@ A paragraph
 Another paragraph (but no @var: line)
     arg=var1
 
+    feature=variant1-feat
+a feature
 doc symbol=Variant2
     body=
 
@@ -158,6 +160,10 @@ the second
 argument
     arg=arg3
 
+    feature=cmd-feat1
+a feature
+    feature=cmd-feat2
+another feature
     section=Note
 @arg3 is undocumented
     section=Returns
@@ -180,6 +186,10 @@ Duis aute irure dolor
 doc symbol=cmd-boxed
     body=
 If you're bored enough to read this, go see a video of boxed cats
+    feature=cmd-feat1
+a feature
+    feature=cmd-feat2
+another feature
     section=Example
 -> in
 

tests/qapi-schema/doc-undoc-feature.out

@@ -17,3 +17,5 @@ command foo None -> None
 doc symbol=foo
     body=
 
+    feature=doc
+documented feature

tests/qapi-schema/test-qapi.py

@@ -117,6 +117,8 @@ def test_frontend(fname):
         print('    body=\n%s' % doc.body.text)
         for arg, section in doc.args.items():
             print('    arg=%s\n%s' % (arg, section.text))
+        for feat, section in doc.features.items():
+            print('    feature=%s\n%s' % (feat, section.text))
         for section in doc.sections:
             print('    section=%s\n%s' % (section.name, section.text))