Update whats new for dev and 7.21

docs/source/whatsnew/development.rst

@@ -134,6 +134,24 b' Currently, autosuggestions are only shown in the emacs or vi insert editing mode'
 - The ctrl e, ctrl f, and alt f shortcuts work by default in emacs mode.
 - To use these shortcuts in vi insert mode, you will have to create `custom keybindings in your config.py <https://github.com/mskar/setup/commit/2892fcee46f9f80ef7788f0749edc99daccc52f4/>`__.
 
+
+Show pinfo information in ipdb using "?" and "??"
+-------------------------------------------------
+
+In IPDB, it is now possible to show the information about an object using "?"
+and "??", in much the same way it can be done when using the IPython prompt::
+
+    ipdb> partial?
+    Init signature: partial(self, /, *args, **kwargs)
+    Docstring:
+    partial(func, *args, **keywords) - new function with partial application
+    of the given arguments and keywords.
+    File:           ~/.pyenv/versions/3.8.6/lib/python3.8/functools.py
+    Type:           type
+    Subclasses:
+
+Previously, "pinfo" or "pinfo2" command had to be used for this purpose.
+
 .. DO NOT EDIT THIS LINE BEFORE RELEASE. FEATURE INSERTION POINT.
 
 As a reminder, IPython master has diverged from the 7.x branch, thus master may

docs/source/whatsnew/version7.rst

@@ -2,6 +2,40 b''
  7.x Series
 ============
 
+.. _version 721:
+
+IPython 7.21
+============
+
+IPython 7.21 is the first release we have back on schedule of one release every
+month; it contains a number of minor fixes and improvements, notably, the new
+context command for ipdb
+
+
+New "context" command in ipdb
+-----------------------------
+
+It is now possible to change the number of lines shown in the backtrace
+information in ipdb using "context" command. :ghpull:`12826`
+
+(thanks @MrMino, there are other improvement from them on master).
+
+Other notable changes in IPython 7.21
+-------------------------------------
+
+- Fix some issues on new osx-arm64 :ghpull:`12804`, :ghpull:`12807`. 
+- Compatibility with Xeus-Python for debugger protocol, :ghpull:`12809`
+- Misc docs fixes for compatibility and uniformity with Numpydoc.
+  :ghpull:`12824`
+
+
+Thanks
+------
+
+Many thanks to all the contributors to this release you can find all individual
+contribution to this milestone `on github <https://github.com/ipython/ipython/milestone/83>`_.
+
+
 .. _version 720:
 
 IPython 7.20