fix(docs): multi-level list dedent indentation #40850

Problem:
The list-item indentation logic in `gen_help_html.lua` tracks `opt.indent` that
only decrements by one level when a list item is less indented than its sibling.
Dedenting across multiple nesting levels at once produces the wrong left margin.

Solution:
Track the exact leading whitespace for each indent level in a `opt.indent_ws` stack:
- On reset or a top-level item initialize the stack with the current item's
  whitespace.
- When indenting deeper push the current whitespace at the new level.
- When dedenting pop every level whose tracked whitespace is deeper than the
  current item (reaching the correct ancestor level).

0 files changed, 0 insertions, 0 deletions