Update documentation and migration notes for v2 #498

Job	Run time
Client Conformance (sse-retry)	54s
Client Conformance (initialize)	48s
Client Conformance (tools_call)	46s
Auth Conformance (auth/metadata-var1)	57s
Auth Conformance (auth/scope-omitted-when-undefined)	46s
Server Conformance	58s
Auth Conformance (auth/metadata-default)	50s
Auth Conformance (auth/metadata-var2)	59s
Auth Conformance (auth/token-endpoint-auth-basic)	52s
Auth Conformance (auth/scope-from-scopes-supported)	59s
Auth Conformance (auth/scope-step-up)	43s
Auth Conformance (auth/token-endpoint-auth-post)	58s
Auth Conformance (auth/pre-registration)	50s
Auth Conformance (auth/token-endpoint-auth-none)	59s
Auth Conformance (auth/metadata-var3)	53s
Auth Conformance (auth/basic-cimd)	48s
Auth Conformance (auth/scope-retry-limit)	50s
Client Conformance (elicitation-sep1034-client-defaults)	46s
Auth Conformance (auth/scope-from-www-authenticate)	57s
	16m 33s

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