Wrapping of @nodedescription

[Gavin Smith]

I've started changing over the manuals to use @nodedescription but I
noticed an issue with line wrapping.  What was

* Stand-alone Info::            What is Info?
* Node Commands::               Commands for selecting a new node.
* More Node Commands::          Further commands for changing the node.
* Cursor Commands::             Commands which move the cursor within a node.
* Scrolling Commands::          Commands for reading the text within a node.
* Searching Commands::          Commands for searching an Info file.
* Index Commands::              Commands for looking up in indices.
* Xref Commands::               Commands for selecting cross-references.
* Window Commands::             Commands which manipulate multiple windows.
* Printing Nodes::              How to print out the contents of a node.
* Miscellaneous Commands::      A few commands that defy categorization.
* Invoking Info::               Options you can pass on the command line.
* Variables::                   How to change the default behavior of Info.
* Colors and Styles::           Customize the colors used by Info.
* Custom Key Bindings::         How to define your own key-to-command bindings.
* MS-DOS/Windows keybindings::  Alternate DOS/Windows keybindings.
* Index::                       Global index.

becomes when automatically generated

* Stand-alone Info::           What is Info?
* Node Commands::              Commands for selecting a new node.
* More Node Commands::         Further commands for changing the node.
* Cursor Commands::            Commands which move the cursor within a
                               node.
* Scrolling Commands::         Commands for reading the text within a
                               node.
* Searching Commands::         Commands for searching an Info file.
* Index Commands::             Commands for looking up in indices.
* Xref Commands::              Commands for selecting cross-references.
* Window Commands::            Commands which manipulate multiple
                               windows.
* Printing Nodes::             How to print out the contents of a node.
* Miscellaneous Commands::     A few commands that defy categorization.
* Invoking Info::              Options you can pass on the command line.
* Variables::                  How to change the default behavior of
                               Info.
* Colors and Styles::          Customize the colors used by Info.
* Custom Key Bindings::        How to define your own key-to-command
                               bindings.
* MS-DOS/Windows keybindings:: Alternate DOS/Windows keybindings.
* Index::                      Global index.

As you can see, a maximum line length of 72 characters is being used.  I
think this should be a maximum length of 79 characters to recreate the
menu as it was.