backend dev documentation does not boot portal

[inodb]

E.g. noauthsessionservice, is not an allowed parameter anymore and fails with:

Field cacheMapUtil in org.cbioportal.service.impl.CacheServiceImpl required a bean of type 'org.cbioportal.persistence.cachemaputil.CacheMapUtil' that could not be found.
The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)

The allowed values since v6 are:

@AllowedValues(values = {"false", "saml", "oauth2",
     "optional_oauth2", "saml_plus_basic"})```