Jira reader: use span with class underline for inserted text

Jira text which is marked as `+inserted+` is converted into pandoc's
default representation for underlined text: a span with class
`underline`. Previously, the span was marked with the non-standard class
`inserted`.

Closes: #6237

src/Text/Pandoc/Readers/Jira.hs

@@ -140,7 +140,7 @@ jiraToPandocInlines = \case
 
     fromStyle = \case
       Jira.Emphasis    -> emph
-      Jira.Insert      -> spanWith ("", ["inserted"], [])
+      Jira.Insert      -> spanWith ("", ["underline"], [])
       Jira.Strikeout   -> strikeout
       Jira.Strong      -> strong
       Jira.Subscript   -> subscript

test/Tests/Readers/Jira.hs

@@ -126,6 +126,10 @@ tests =
       let attr = ("", [], [("align", "right"), ("vspace", "4")])
       in para $ imageWith attr "image.gif" "Hello" mempty
 
+    , "inserted text" =:
+      "+the new version+" =?>
+      para (spanWith ("", ["underline"], []) "the new version")
+
     , "HTML entity" =:
       "me & you" =?> para "me & you"