fix_format_in_api_spec

[PedroDiez]

What type of PR is this?

Add one of the following kinds:

• correction

What this PR does / why we need it:

Fix API spec format

Which issue(s) this PR fixes:

Fixes #38

Special notes for reviewers:

Cover this code/API_definitions/blockchain_public_address.yaml Error: 10:1 [trailing-spaces] trailing spaces Error: 58:11 [indentation] wrong indentation: expected 12 but found 10 Error: 114:11 [indentation] wrong indentation: expected 12 but found 10 Error: 163:11 [indentation] wrong indentation: expected 12 but found 10 Error: 241:1 [trailing-spaces] trailing spaces Error: 257:17 [trailing-spaces] trailing spaces Error: 293:1 [trailing-spaces] trailing spaces Error: 309:17 [trailing-spaces] trailing spaces

@rartych

• regarding indentation errors do not sure needed more indentation but doing as linter indicates (is it ok in this way?)
• do not identify any point missed regarding Error: 293:1 [trailing-spaces] trailing spaces

@grgpapadopoulos

• please approve it so i can check again linter

[PedroDiez]

Thanks Rafal, Georgios!! Going to merge and test with the new commonalities configuration