parse url for api docs

[ayrat555]

the scheme was hardcoded to HTTP in api docs. Because of that api requests didn't work if the scheme is HTTPS

Changelog

• parse url for api docs

[coveralls]

Pull Request Test Coverage Report for Build 8208be94-f678-4291-b37f-620c430a1649

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 80.97%

---

Files with Coverage Reduction	New Missed Lines	%
apps/block_scout_web/lib/block_scout_web/views/api_docs_view.ex	1	92.86%
apps/explorer/lib/explorer/market/market_history_cache.ex	2	88.89%

Totals
Change from base Build d28b73fc-2367-4891-85c9-038031a4a315:	-0.03%
Covered Lines:	5161
Relevant Lines:	6374

---

💛 - Coveralls