[clang-format] Alignment of consecutive comments

With clang-format version 22.1.8, I obtain:

```
struct hissqlite {
char *path; /* SQLite database file path. */
struct history *history; /* For his_seterror(). */
sqlite3 *db;
int flags; /* HIS_RDONLY / HIS_RDWR / ... */
};
```

instead of what I would have expected:

```
struct hissqlite {
char *path; /* SQLite database file path. */
struct history *history; /* For his_seterror(). */
sqlite3 *db;
int flags; /* HIS_RDONLY / HIS_RDWR / ... */
};
```

Maybe it is an option I have overlooked (though I do not see one in `AlignTrailingComments` which would do that). I think the default would be to align the last comment with the two other ones.

Start by reproducing the result with clang-format 22.1.8 using the struct example in the issue. Then inspect how the AlignTrailingComments option handles consecutive comments; the work is done when the final comment aligns with the preceding comments as shown in the expected output.

Written by the indexing model from the issue text.