Boldwin: update documentation

[Wls-demo]

🏷 Type of documentation

• new bid adapter
• update bid adapter
• new feature
• text edit only (wording, typos)
• bugfix (code examples)
• new examples

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• For new adapters check submitting your adapter docs

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[bretg]

@Wls-demo - it's an unusual change to remove a formerly required parameter. What does this statement mean "in case you integrate with Boldwin bidder via an endpoint URL."? Where would such a URL be specified?

Also, note that there are many header fields requested in https://docs.prebid.org/dev-docs/bidder-adaptor.html#submitting-your-adapter missing from this file. Please consider adding as many as possible so publishers are aware of your capabliities.

tcfeu_supported: true/false
gvl_id: none
usp_supported: true/false
coppa_supported: true/false
gpp_supported: true/false
schain_supported: true/false
dchain_supported: true/false
userId: (list of supported vendors)
media_types: banner, video, native
safeframes_ok: true/false
deals_supported: true/false
floors_supported: true/false
fpd_supported: true/false
pbjs: true/false
pbs: true/false
prebid_member: true/false
multiformat_supported: will-bid-on-any, will-bid-on-one, will-not-bid
ortb_blocking_supported: true/partial/false

[Wls-demo]

@bretg it was not required parameter. Its required to use one parameter - either placementId or endpointId, but for now we are good to use only endpointId.
Also additional headers fields was added.