[rocm-libraries] ROCm/rocm-libraries#5038 (commit 6e74de7)

[CK_BUILDER] Update developer notes in the CK Builder source directories (#5038)

## Motivation

This PR updates the developer notes for the CK Tile builder. It captures the current state of the implementation in more detail, and frames the description around the need to have true facade.

There is no functional change, only better alignment of developer notes with the current code.

This doc clearly explains the current technical debt: that we have created many facades that expose
the implementation details. There is an expanded section on reflection that explains how unified
reflection will help clarify the unified builder design.

Additional changes are just better accounting for the current state of the code, including previously
undocumented operations. A few typos and cosmetic issues are cleaned up, too.