[3.14] gh-143774 - Improve IDLE Format Paragraph doc (GH-143775)

Doc/library/idle.rst

@@ -158,7 +158,7 @@ Go to Line
 
 Show Completions
    Open a scrollable list allowing selection of existing names. See
-   :ref:`Completions <completions>` in the Editing and navigation section below.
+   :ref:`Completions <completions>` in the Editing and Navigation section below.
 
 Expand Word
    Expand a prefix you have typed to match a full word in the same window;
@@ -167,7 +167,7 @@ Expand Word
 Show Call Tip
    After an unclosed parenthesis for a function, open a small window with
    function parameter hints.  See :ref:`Calltips <calltips>` in the
-   Editing and navigation section below.
+   Editing and Navigation section below.
 
 Show Surrounding Parens
    Highlight the surrounding parenthesis.
@@ -178,9 +178,9 @@ Format menu (Editor window only)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Format Paragraph
-   Reformat the current blank-line-delimited paragraph in comment block or
-   multiline string or selected line in a string.  All lines in the
-   paragraph will be formatted to less than N columns, where N defaults to 72.
+   Rewrap the text block containing the text insert cursor.
+   Avoid code lines.  See :ref:`Format block<format-block>` in the
+   Editing and Navigation section below.
 
 Indent Region
    Shift selected lines right by the indent width (default 4 spaces).
@@ -566,6 +566,20 @@ In an editor, import statements have no effect until one runs the file.
 One might want to run a file after writing import statements, after
 adding function definitions, or after opening an existing file.
 
+.. _format-block:
+
+Format block
+^^^^^^^^^^^^
+
+Reformat Paragraph rewraps a block ('paragraph') of contiguous equally
+indented non-blank comments, a similar block of text within a multiline
+string, or a selected subset of either.
+If needed, add a blank line to separate string from code.
+Partial lines in a selection expand to complete lines.
+The resulting lines have the same indent as before
+but have maximum total length of N columns (characters).
+Change the default N of 72 on the Window tab of IDLE Settings.
+
 .. _code-context:
 
 Code Context

Misc/NEWS.d/next/IDLE/2026-01-13-01-21-20.gh-issue-143774.rqGwX1.rst

@@ -0,0 +1 @@
+Better explain the operation of Format / Format Paragraph.