bpo-33821: Update idlelib subsection of What's New 3.7 (#7590)

Doc/whatsnew/3.7.rst

@@ -962,8 +962,10 @@ It is used when ``http.server`` is run with ``-m``.
 idlelib and IDLE
 ----------------
 
+Multiple fixes for autocompletion. (Contributed by Louie Lu in :issue:`15786`.)
+
 Module Browser (on the File menu, formerly called Class Browser),
-now displays nested functions and classed in addition to top-level
+now displays nested functions and classes in addition to top-level
 functions and classes.
 (Contributed by Guilherme Polo, Cheryl Sabella, and Terry Jan Reedy
 in :issue:`1612262`.)
@@ -975,7 +977,7 @@ to improve both appearance and function.
 The font sample now includes a selection of non-Latin characters so that
 users can better see the effect of selecting a particular font.
 (Contributed by Terry Jan Reedy in :issue:`13802`.)
-The sample can be edited to test other characters.
+The sample can be edited to include other characters.
 (Contributed by Serhiy Storchaka in :issue:`31860`.)
 
 The IDLE features formerly implemented as extensions have been reimplemented
@@ -983,6 +985,12 @@ as normal features.  Their settings have been moved from the Extensions tab
 to other dialog tabs.
 (Contributed by Charles Wohlganger and Terry Jan Reedy in :issue:`27099`.)
 
+Editor code context option revised.  Box displays all context lines up to
+maxlines.  Clicking on a context line jumps the editor to that line.  Context
+colors for custom themes is added to Highlights tab of Settings dialog.
+(Contributed by Cheryl Sabella and Terry Jan Reedy in :issue:`33642`,
+:issue:`33768`, and :issue:`33679`,
+
 The changes above have been backported to 3.6 maintenance releases.