Update documentation about supported extensions and features

[NelsonVides]

There was no mention of retraction nor inbox in this page.

[codecov]

Codecov Report

Merging #3079 (c3f4869) into master (fad3ff7) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3079      +/-   ##
==========================================
- Coverage   78.82%   78.81%   -0.01%     
==========================================
  Files         379      379              
  Lines       31234    31234              
==========================================
- Hits        24620    24618       -2     
- Misses       6614     6616       +2     

Impacted Files	Coverage Δ
src/cassandra/mongoose_cassandra_worker.erl	70.75% <0.00%> (-2.36%)	⬇️
src/mod_muc_room.erl	77.33% <0.00%> (-0.24%)	⬇️
src/mod_roster.erl	76.56% <0.00%> (-0.24%)	⬇️
src/ejabberd_s2s_out.erl	57.89% <0.00%> (-0.23%)	⬇️
src/ejabberd_c2s.erl	89.18% <0.00%> (-0.23%)	⬇️
src/mod_muc_log.erl	77.72% <0.00%> (ø)
src/ejabberd_sm.erl	76.21% <0.00%> (+0.30%)	⬆️
src/muc_light/mod_muc_light.erl	84.27% <0.00%> (+0.87%)	⬆️
src/ejabberd_admin.erl	60.18% <0.00%> (+0.94%)	⬆️
src/wpool/mongoose_wpool.erl	82.00% <0.00%> (+1.00%)	⬆️
... and 3 more

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[DenysGonchar]

👍

[DenysGonchar]

looks good