Correct API Endpoint for Bot Upgrade and Fix Broken link

[TheYoBots]

1. Correct 'Bot Upgrade' API Endpoint:

   • Do note that the ‘Bot Upgrade’ API Endpoint was earlier "api/bot/accounts/upgrade" instead of "api/bot/account/upgrade" which has been corrected.

2. Fix broken link

   • The link under lichess api was directed to the old bot api url. I’ve changed it to use https://lichess.org/api#tag/Bot instead of https://lichess.org/api#tag/Chess-Bot as the latter redirects to https://lichess.org/api

[coveralls]

Pull Request Test Coverage Report for Build 133

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.765%

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Totals
Change from base Build 121:	0.0%
Covered Lines:	221
Relevant Lines:	226

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💛 - Coveralls

[tailuge]

Thanks.