Fix link to bcm.c in FIPS.md

[justsmth]

Description of changes:

The link to bcm.c in the Linux Shared Build section of FIPS.md wass formatted incorrectly.

• Update can be seen here.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.74%. Comparing base (3d3d3a3) to head (3e3a25e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2309   +/-   ##
=======================================
  Coverage   78.73%   78.74%           
=======================================
  Files         616      616           
  Lines      107584   107584           
  Branches    15286    15286           
=======================================
+ Hits        84709    84713    +4     
+ Misses      22221    22217    -4     
  Partials      654      654           

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