Fixed some whitespace in mods-available/eap

Make consistently use of tabs, instead of mostly tabs and sometimes spaces.
Fixed some capitalization in mods-available/eap
Reintroduced a comma to make sentence readable

Accidentally removed in 8430d8fa618140bafe289142626061fdc5419d58
Replaced references to MS-CHAP-Success with MS2-CHAP-Success

The first attribute doesn't exist.
Remove re-defined attributes
Fix and document check_timeout which helps with check_interval
Merge pull request #687 from qnet-herwin/documentation

Documentation fixes