update TROUBLESHOOTING.md to link to correct use cases page

[jpurpura]

editted "our use cases" link

Fixes

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• updates link in Troubleshooting readme to direct to correct use cases link

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[SendGridDX]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #603 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #603   +/-   ##
=======================================
  Coverage   86.61%   86.61%           
=======================================
  Files          32       32           
  Lines         979      979           
  Branches      131      131           
=======================================
  Hits          848      848           
  Misses         67       67           
  Partials       64       64

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[thinkingserious]

Hello @jpurpura,

Thanks again for the PR!

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