[doc] Update ROADMAP.rst and some documentation

Change-Id: I76317e4cebcf865062f5a501253d2494c4ce957a
---
M ROADMAP.rst
M scripts/CHANGELOG.rst
M pywikibot/page/_filepage.py
M pywikibot/site/_apisite.py
4 files changed, 40 insertions(+), 5 deletions(-)

diff --git a/ROADMAP.rst b/ROADMAP.rst
index 74b3d74..20647e7 100644
--- a/ROADMAP.rst
+++ b/ROADMAP.rst
@@ -1,6 +1,11 @@
 Current release
 ---------------
 
+* *modules_only_mode* parameter of :class:`data.api.ParamInfo`, its *paraminfo_keys* class attribute
+  and its *preloaded_modules* property was deprecated, the :meth:`data.api.ParamInfo.normalize_paraminfo`
+  method became a staticmethod (:phab:`T306637`)
+* raise ValueError when :class:`pywikibot.FilePage` title doesn't have a valid file extension (:phab:`T345786`)
+* :attr:`site.APISite.file_extensions <pywikibot.site._apisite.APISite.file_extensions>` property was added (:phab:`T345786`)
 * Extract code and family from dbname in :meth:`site.APISite.fromDBName()
   <pywikibot.site._apisite.APISite.fromDBName>` (:phab:`T345036`)
 * ``dropdelay`` and ``releasepid`` attributes of :class:`throttle.Throttle` where deprecated
@@ -16,6 +21,8 @@
 Deprecations
 ------------
 
+* 8.4.0: *modules_only_mode* parameter of :class:`data.api.ParamInfo`, its *paraminfo_keys* class attribute
+  and its preloaded_modules property will be removed
 * 8.4.0: *dropdelay* and *releasepid* attributes of :class:`throttle.Throttle` will be removed
   in favour of *expiry* class attribute
 * 8.2.0: :func:`tools.itertools.itergroup` will be removed in favour of :func:`backports.batched`
diff --git a/pywikibot/page/_filepage.py b/pywikibot/page/_filepage.py
index 0161835..4cb91fe 100644
--- a/pywikibot/page/_filepage.py
+++ b/pywikibot/page/_filepage.py
@@ -32,14 +32,25 @@
 
 class FilePage(Page):
 
-    """
-    A subclass of Page representing a file description page.
+    """A subclass of Page representing a file description page.
 
-    Supports the same interface as Page, with some added methods.
+    Supports the same interface as Page except *ns*; some added methods.
     """
 
     def __init__(self, source, title: str = '') -> None:
-        """Initializer."""
+        """Initializer.
+
+        .. versionchanged:: 8.4
+           check for valid extensions.
+
+        :param source: the source of the page
+        :type source: pywikibot.page.BaseLink (or subclass),
+            pywikibot.page.Page (or subclass), or pywikibot.page.Site
+        :param title: normalized title of the page; required if source is a
+            Site, ignored otherwise
+        :raises ValueError: Either the title is not in the file
+            namespace or does not have a valid extension.
+        """
         self._file_revisions = {}  # dictionary to cache File history.
         super().__init__(source, title, 6)
         if self.namespace() != 6:
diff --git a/pywikibot/site/_apisite.py b/pywikibot/site/_apisite.py
index 1a1f0ee..99be28c 100644
--- a/pywikibot/site/_apisite.py
+++ b/pywikibot/site/_apisite.py
@@ -473,7 +473,10 @@
 
     @property
     def file_extensions(self) -> List[str]:
-        """File extensions enabled on the wiki."""
+        """File extensions enabled on the wiki.
+
+        .. versionadded:: 8.4
+        """
         return sorted(e['ext'] for e in self.siteinfo.get('fileextensions'))
 
     @property
diff --git a/scripts/CHANGELOG.rst b/scripts/CHANGELOG.rst
index 6403ea8..f87830d 100644
--- a/scripts/CHANGELOG.rst
+++ b/scripts/CHANGELOG.rst
@@ -6,6 +6,11 @@
 
 * L10N for several scripts
 
+category_graph
+~~~~~~~~~~~~~~
+
+* Wrap DOT-string in curly braces (:phab:`T346007`)
+
 checkimages
 ~~~~~~~~~~~
 

