Fix typo in fine-grained-security.mdx

[DocentBF]

Just fix typo in doc

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.18%. Comparing base (53f9d49) to head (ab9a08b).
Report is 92 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #705      +/-   ##
============================================
- Coverage     95.72%   95.18%   -0.54%     
- Complexity     1773     1824      +51     
============================================
  Files           154      174      +20     
  Lines          4586     4926     +340     
============================================
+ Hits           4390     4689     +299     
- Misses          196      237      +41     

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[oojacoboo]

Thanks!