Add =ON to cmake flag definition

[Justin Bogner]

Albert Astals Cid <albert.astals at canonical.com> writes:
> Hi, i think it'd make sense to specify the full command you have to
> write to command line so one can just copy&paste from the
> documentation.

Seems reasonable. Do you need somebody to commit this for you?

> Please CC me i'm not on the list
>
> Cheers,
>   Albert
>
> Index: docs/ModernizerUsage.rst
> ===================================================================
> --- docs/ModernizerUsage.rst	(revision 236973)
> +++ docs/ModernizerUsage.rst	(working copy)
> @@ -38,7 +38,7 @@
>    ``<build-path>`` is the directory containing a *compilation databasefile*, a
>    file named ``compile_commands.json``, which provides compiler arguments for
>    building each source file. CMake can generate this file by specifying
> -  ``-DCMAKE_EXPORT_COMPILE_COMMANDS`` when running CMake. Ninja_, since v1.2 can
> +  ``-DCMAKE_EXPORT_COMPILE_COMMANDS=ON`` when running CMake. Ninja_, since v1.2 can
>    also generate this file with ``ninja -t compdb``. If the compilation database
>    cannot be used for any reason, an error is reported.
>  
> Index: docs/clang-modernize.rst
> ===================================================================
> --- docs/clang-modernize.rst	(revision 236973)
> +++ docs/clang-modernize.rst	(working copy)
> @@ -51,7 +51,7 @@
>  A `compilation database`_ contains the command-line arguments for multiple
>  files. If the code you want to transform can be built with CMake, you can
>  generate this database easily by running CMake with the
> -``-DCMAKE_EXPORT_COMPILE_COMMANDS`` option. The Ninja_ build system, since
> +``-DCMAKE_EXPORT_COMPILE_COMMANDS=ON`` option. The Ninja_ build system, since
>  v1.2, can create this file too using the *compdb* tool: ``ninja -t compdb``. If
>  you're not already using either of these tools or cannot easily make use of
>  them you might consider looking into Bear_.
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