bpo-34006: Revert line length limit for Windows help docs (GH-8051)

 The line-length limit is not needed because the pages appear in a separate app rather
 than on a browser tab.  It can also interact badly with the DPI setting.
(cherry picked from commit d824ca7f)
Co-authored-by: Zachary Ware <zachary.ware@gmail.com>

Doc/make.bat

@@ -131,6 +131,9 @@ if exist ..\Misc\NEWS (
 if NOT "%PAPER%" == "" (
     set SPHINXOPTS=-D latex_elements.papersize=%PAPER% %SPHINXOPTS%
 )
+if "%1" EQU "htmlhelp" (
+    set SPHINXOPTS=-D html_theme_options.body_max_width=none %SPHINXOPTS%
+)
 cmd /S /C "%SPHINXBUILD% %SPHINXOPTS% -b%1 -dbuild\doctrees . "%BUILDDIR%\%1" %2 %3 %4 %5 %6 %7 %8 %9"
 
 if "%1" EQU "htmlhelp" (

Misc/NEWS.d/next/Windows/2018-07-02-14-19-32.bpo-34006.7SgBT_.rst

+Revert line length limit for Windows help docs. The line-length limit is not
+needed because the pages appear in a separate app rather than on a browser
+tab.  It can also interact badly with the DPI setting.