fix: Specifying storage account name

[okumurays]

What did you implement:

Closes #396

How did you implement it:

Add statement about specifying storage account.

How can we verify it:

Could you check if my understanding is correct?

Todos:

Note: Run npm run test:ci to run all validation checks on proposed changes

• [ ] Ensure there are no lint errors.
  Validate via npm run lint
  Note: Some reported issues can be automatically fixed by running npm run lint:fix
• [ ] Write tests and confirm existing functionality is not broken.
  Validate via npm test
• [x] Write documentation
• [ ] Provide verification config / commands / resources
• [ ] Enable "Allow edits from maintainers" for this PR
• [ ] Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov[bot]]

Codecov Report

Merging #425 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #425   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files          48       48           
  Lines        1782     1782           
  Branches      245      280   +35     
=======================================
  Hits         1683     1683           
  Misses         98       98           
  Partials        1        1

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[okumurays]

Yes. Of course. I've already created my PR to dev branch. Could you review it again? https://github.com/serverless/serverless-azure-functions/pull/426

[mydiemho]

duplicate of #426