[Lazarus] FPDocmanager readme suggestion

[Hans-Peter Diettrich]

Reinier Olislagers schrieb:
> Decided to try FPDocmanager. The readme wasn't entirely clear to me.
> 
> What about a change like this? Additionally, might it not be better to
> remove the entire paragraph I marked Obsolete?

The FPDocManager requires (parts of) FPC 2.7, so many users may wonder 
why it doesn't work right now with the current release. The notes 
explain how to use it with older releases, and what changed from earlier 
versions of FPDocManager. They will be removed when FPC 2.7 becomes the 
new standard compiler for Lazarus.

DoDi