(docs) Fix wrong anchor

[Jinops]

Some anchor tags are not working on https://mybatis.org/mybatis-3/configuration.html.
typeAliases, typeHandlers, objectFactory, and databaseidprovider are linked to ids with wrong capitalization.
So I fixed it. 😄

Also, add missing databaseIdProvider menu on japanese language.

[hazendaz]

Seems odd to have to go to all lower case. Did this work in the past? We did upgrade to the long ongoing maven site 4.0 which has a lot of bugs as we have found out. Maven had fixed many and has a release coming out soon. I'd like to wait here unless this was always an issue and not recent in last few months.

[Jinops]

I'm not sure if it really worked in the past or not.
The current state is that these titles have ids in lowercase(e.g. #databaseidprovider), while some anchors try to reference #databaseIdProvider.
I know that this issue doesn't need to be handled right now. So, feel free to look into it (or not).
Thank you!