Improve GraphQL Documentation with Enhanced Instructions and Links

[EtayM]

This PR improves the GraphQL documentation by adding detailed information, clearer instructions, and hyperlinks to the Enjin documentation website.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.92%. Comparing base (9cf56cd) to head (b67d02a).
Report is 40 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #84      +/-   ##
============================================
- Coverage     96.03%   89.92%   -6.12%     
- Complexity      300      407     +107     
============================================
  Files            62       70       +8     
  Lines          1792     2431     +639     
============================================
+ Hits           1721     2186     +465     
- Misses           71      245     +174     

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