Update the provider default keysizes in the "JDK Providers Documentation"

With JDK-8267319, the default key sizes for various algorithms are increased and default digest algorithm is shifted to SHA-384 from SHA-256. "JDK Providers Documentation" should be updated accordingly.

RSA, RSASSA-PSS, DH: from 2048->3072
EC: from 256->384
AES: from 128->256 (depends on runtime crypto policy checking)

Need to update the "Keysize Restrictions" for various providers.