docs: Fix syntax (#525)

I'd inadvertently used reStructured Text syntax instead of Markdown
here.

Author: jholveck

docs/source/release-history/v11.0.0.md

@@ -15,10 +15,10 @@ writing, but should be by the time we release 11.0!)
 
 #### ScreenShot attributes
 
-The :py:attr:`mss.ScreenShot.raw` attribute has been removed.  Use the :py:attr:`mss.ScreenShot.bgra` property instead.
+The {py:attr}`mss.ScreenShot.raw` attribute has been removed.  Use the {py:attr}`mss.ScreenShot.bgra` property instead.
 
-The :py:attr:`mss.ScreenShot.bgra` and :py:attr:`mss.ScreenShot.rgb` properties now will return read-only bytes-like
-:py:type:`memoryview` objects, not necessarily :py:type:`bytes` or :py:type:`bytearray` objects.  For practical use
+The {py:attr}`mss.ScreenShot.bgra` and {py:attr}`mss.ScreenShot.rgb` properties now will return read-only bytes-like
+{py:type}`memoryview` objects, not necessarily {py:type}`bytes` or {py:type}`bytearray` objects.  For practical use
 cases, this should not be noticible.  This change was allows faster access to screenshot data, with fewer memory copies.
 
 ### Python 3.9 EOL