loadMintIgnore mis-parses directory patterns without a leading slash

[dumanoglu1]

loadMintIgnore() handles directory patterns ending in /*, but it always removes the first character with slice(1, -2).

File evidence:

• scripts/lib/docs-utils.js checks if (trimmed.endsWith('/*')).
• That branch stores ignored.dirs.add(trimmed.slice(1, -2)), assuming the pattern starts with /.
• The file-pattern branch immediately below supports both leading-slash and bare filenames, so a contributor can reasonably expect foo/* to work the same way as /foo/*.

For a slashless directory pattern such as draft-notes/*, the parser stores raft-notes, so the intended directory is not ignored and there is no warning.

Expected behavior: directory patterns should preserve the directory name whether they are written as /foo/* or foo/*.