Update MUC Light docs

[jacekwegr]

This PR updates the 8.1. XEP-0045 mappings section of the Multi-User Chat (MUC) Light documentation to make it more clear and easier to understand.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (0bd9702) 82.20% compared to head (dee05a1) 82.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4034      +/-   ##
==========================================
+ Coverage   82.20%   82.21%   +0.01%     
==========================================
  Files         536      536              
  Lines       33782    33782              
==========================================
+ Hits        27769    27774       +5     
+ Misses       6013     6008       -5     

see 5 files with indirect coverage changes

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[mongoose-im]

small_tests_24 / small_tests / dee05a1
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small_tests_25 / small_tests / dee05a1
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small_tests_25_arm64 / small_tests / dee05a1
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ldap_mnesia_24 / ldap_mnesia / dee05a1
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dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / dee05a1
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ldap_mnesia_25 / ldap_mnesia / dee05a1
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dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / dee05a1
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dynamic_domains_mysql_redis_25 / mysql_redis / dee05a1
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dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / dee05a1
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pgsql_mnesia_24 / pgsql_mnesia / dee05a1
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elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / dee05a1
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internal_mnesia_25 / internal_mnesia / dee05a1
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pgsql_mnesia_25 / pgsql_mnesia / dee05a1
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mssql_mnesia_25 / odbc_mssql_mnesia / dee05a1
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mysql_redis_25 / mysql_redis / dee05a1
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[chrzaszcz]

Looks good 👍