Fixed overlapping API dropdown

[jsorohova]

Problem:
If the API name is too long, it was overlapping in the API details page

Solution:
Added a max-width so it doesn't overlap

[github-actions]

Accessibility Insights Action: All applicable checks passed

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This scan used axe-core 4.3.2 with Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36.