Misc documentation fixes.

Should in particular close Quansight/deshaw#227

IPython/core/magics/basic.py

@@ -368,7 +368,7 b' Currently the magic system has the following functions:""",'
 
         If called without arguments, acts as a toggle.
 
-        When in verbose mode the value --show (and --hide)
+        When in verbose mode the value `--show` (and `--hide`)
         will respectively show (or hide) frames with ``__tracebackhide__ =
         True`` value set.
         """

docs/source/interactive/shell.rst

@@ -1,10 +1,10 b''
-.. _ipython_as_shell:
 
 .. note::
 
    This page has been kept for historical reason. You most likely want to use
    `Xonsh <https://xon.sh/>`__ instead of this.
 
+.. _ipython_as_shell:
 
 =========================
 IPython as a system shell

docs/source/whatsnew/version7.rst

@@ -241,6 +241,7 b' such that it allows autoplay.'
     the HTML allowing it. It also could get blocked by some browser extensions.
 
 Try it out!
+
 ::
 
     In [1]: from IPython.display import YouTubeVideo
@@ -1368,7 +1369,6 b' Miscellaneous'
 IPython 7.3.0
 =============
 
-.. _whatsnew720:
 
 IPython 7.3.0 bring several bug fixes and small improvements that you will
 described bellow. 
@@ -1393,6 +1393,8 b' Misc bug fixes and improvements:'
  - Re-initialize posix aliases after a ``%reset`` :ghpull:`11528`
  - Allow the IPython command line to run ``*.ipynb`` files :ghpull:`11529`
 
+.. _whatsnew720:
+   
 IPython 7.2.0
 =============
 
@@ -1423,8 +1425,7 b" and we're now proud to have code contributed by Chris in IPython."
 OSMagics.cd_force_quiet configuration option
 --------------------------------------------
 
-You can set this option to force the %cd magic to behave as if ``-q`` was passed:
-::
+You can set this option to force the %cd magic to behave as if ``-q`` was passed::
 
     In [1]: cd /
     /