Fix typos in JsonSchema's methods

[fushar]

• asContainerSchema -> asContainerTypeSchema
• asValueSchemaSchema -> asValueTypeSchema

The old methods are marked as deprecated.

[cowtowncoder]

Sounds reasonable, but I will need to wait until master becomes 2.7; this change can not be made in patch version.
Two improvement suggestions:

1. Add @since 2.7 in javadocs for new methods; and a note in @deprecated similarly that deprecation occurred in 2.7
2. Make deprecated methods call the new methods, instead of directly returning. This helps old code with overrides to possibly work.

[fushar]

No problem.

Applied your suggestions.