Update install_from_sources.md

[KeshavSoni2511]

Link for apache maven is updated. Fix for issue #2272

[fgalan]

I have check the maven version installed in the generated docker images

# dpkg -l maven
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=======================================================
ii  maven          3.6.3-5      all          Java software project management and comprehension tool
# 

So I'd suggest to use 3.6.3 version in doc/cygnus-common/installation_and_administration_guide/install_from_sources.md

[KeshavSoni2511]

Hi @fgalan, I have done the changes as per your comment.

[fgalan]

LGTM