docs/183927: missing info about kernel toolchain in kernel building chapter in handbook

[Mateusz Guzik]

>Number:         183927
>Category:       docs
>Synopsis:       missing info about kernel toolchain in kernel building chapter in handbook
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-doc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Nov 13 14:50:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Mateusz Guzik
>Release:        
>Organization:
>Environment:
>Description:
http://www.freebsd.org/doc/handbook/kernelconfig-building.html

http://www.freebsd.org/doc/handbook/kernelconfig-trouble.html

If a user is building a kernel from other freebsd verion than he is currently running, weird failures can occur due to lack of proper toolchain.

Toolchain can by build by:
- buildworld
- toolchain
- kernel-toolchain

This should be noted.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: