docs: Enhance docs/src/api/class-browsercontext.md

[stefanseeger]

For me reading the doc was a bit confusing.

1. The / character implies a "or" to me not an and (but I'm no native speaker)
2. Not highlighting the property names made it harder to read
3. There was a missing "." in the path description

[dgozman]

Thank you for the PR! Unfortunately, it's not enough to just change this file. You need to run npm run build or npm run watch. See contributing guide for more details. Thank you!

[dgozman]

To make it 100% clear:

Suggested change

	- `url` ?<[string]> Either `url` or `domain` and `path` are required. Optional.
	- `domain` ?<[string]> For the cookie to apply to all subdomains as well, prefix domain with a dot, like this: ".example.com". Either `url` or `domain` and `path` are required. Optional.
	- `path` ?<[string]> Either `url` or `domain` and `path` are required. Optional.
	- `url` ?<[string]> Either `url` or both `domain` and `path` are required. Optional.
	- `domain` ?<[string]> For the cookie to apply to all subdomains as well, prefix domain with a dot, like this: ".example.com". Either `url` or both `domain` and `path` are required. Optional.
	- `path` ?<[string]> Either `url` or both `domain` and `path` are required. Optional.