You want to document a global class with ABAP Doc.

Comprehensive and Detailed Explanation from Exact Extract:

ABAP Doc is the integrated documentation system for classes, interfaces, and methods. Rules:

Position → Must be placed directly after the declarative statement (B).

Translatable → ABAP Doc content can be translated (D).

Syntax → Each line must start with ! (E).

HTML tags (A) and repository links (C) are not supported.

Verified Study Guide Reference: ABAP Development Tools (ADT) Documentation – ABAP Doc Annotations and Rules.