LU-13726 build: fix spelling.txt pattern matching

LU-13726 build: fix spelling.txt pattern matching

Fix the overly-broad regexp "%.*s" added for "DNAME" checking,
which matches *all* string format specifiers (since ".*" can be
zero or more characters).  This should be matching the literal
format "%.*s" for fixed-length strings.

Reorder other strings in spelling.txt to (roughly) alphabetical
order to make them easier to find.

Test-Parameters: trivial
Fixes: d097fcc51b ("LU-18810 obd: add a parameter to enable filename encoding")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I0009f9470d16c340ebf5bcd2384b477bac500c13
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58596
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>