Of these three I prefer the first, since it directly generates the
correct string, while the other two change an incorrect string to the
correct one.

While all three are ad hoc fixes, I think the undoubted complexity of a
more general fix is unjustified here, because (unless I've overlooked
something) `interpreted-function' is the only function type symbol
returned by `cl-type-of' in `help-fns-function-description-header' that
results in the problem (since it begins with a vowel).


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-09-18 built on strobelfs2
Repository revision: 3415fa15e4f0a146d1f08df981dc9894bf2ff320
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
System Description: Linux From Scratch r12.3-20

Configured using:
 'configure -C 'CFLAGS=-Og -g3' PKG_CONFIG_PATH=/opt/qt6/lib/pkgconfig'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER
WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM XRANDR GTK3 ZLIB