Documentation feedback - Updates required

[chrisguindon]

• Result definition should be moved to response section: https://api.eclipse.org/#tag/Projects
• Fix typos such as spec_project_working_group="" in the query params section
• Missing description for response headers
• Project params: add in one or two very specific (i.e., full path) examples for how to fetch a specific project. It's not clear to users that they need to replace periods with underscore
• missing description for some query params

[chrisguindon]

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