Theme takes a name in any case, and a miss names its nearest themes

Names were case-sensitive, and a miss listed only the first letter's themes that fitted 40 bytes, 4 of the many d ones. It now lists every theme sharing the first letter when they fit the 128 bytes an Rerror carries, else the nearest by a plain likeness score (shared prefix, the name inside, its letters in order).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 3 insertions, 2 deletions

diff --git a/docs/fs.md b/docs/fs.md
index e13af3c2..5de73b86 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -279,8 +279,9 @@ in Plan 9's words for a ctl (kernel/misc/parse.c:82-97), quoting the line:
 argument to a builtin that takes none, or none to one that needs it (`Msg`,
 `Mount`, `Find`, a setting's value but a switch's, which flips bare);
 `bad value in control message "X"` for a setting's value it does not take
-(for `Theme`, naming the themes that share the name's first letter, since
-all of them, `Themes`'s list, are too many for an error);
+(for `Theme`, whose names are any case, naming every theme that shares
+the name's first letter when they fit the 128 bytes a 9P error carries,
+else the nearest few, since all of them, `Themes`'s list, are too many);
 and `not a session control message "X": write it to pane/<n>/ctl` or `not
 a window control message "X": write it to /ctl` for a word of the other ctl. 9ns maps them all to EINVAL, and a write
 refused here has done nothing. A line that then fails as it runs fails the