[DOC] Update Linear and Logistic Regression Parameters & Improve Documentation

[rithin-pullela-aws]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.
There is a need to update and improve the parameters used in the Linear and Logistic Regression implementations. Specifically, we need to:

1. Add Comprehensive Documentation:
   Provide detailed documentation for the optimizers, objective types, and momentum types supported by the regression models.
2. Fix Parameter Name Typos:
   There are several instances of inconsistent or incorrect parameter names. For example, learningRate should be correctly represented as learning_rate in the request body.
   Parameter typos: learning_rate, momentum_factor, decay_rate, momentum_type, and optimiser
3. Add Descriptions for Other Available Parameters:
   Some parameters like objective, logging_interval, batch_size etc are not mentioned in the documentation.

Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
Find the documentation here.

[rithin-pullela-aws]

Hi team, please assign this issue to me.