[PATCH 1 of 2] help: add additional information in the merge-tools section of config help

[Siddharth Agarwal]

On 05/14/2014 11:16 PM, pierre-yves.david at ens-lyon.org wrote:
> +merges. This section has likely be preconfigured at install time,
> +use :hg:`config merge-tools` to check existing configuration. Also
> +check :hg:`help merge-tools` for details on this topic.

"This section has likely been preconfigured at install time. Use 
:hg:`config merge-tools` to check the existing configuration. Also see 
:hg:`help merge-tools` for more details."