Improve document on metadata fields required for status check

[newgene]

SmartAPI status check does requires servers and paths fields, in addition to the example values for the required parameter(s):

smartAPI/src/utils/monitor.py

Lines 58 to 64 in 90f4510

	try:
	self.api_server = api_doc['servers'][0]['url']
	except KeyError:
	self.api_server = None
	self.api_status = 'incompatible'
	if 'paths' not in api_doc:
	self.api_status = 'incompatible'

Let's state these requirements cleanly in the faq item and update the wording in the status popup dialog.

[newgene]

servers and paths are not required by the OpenAPI specs, so it may be missing from the registered API. We can potentially add a warning msg for these "recommended" but not required fields.