bug#57483: 28.1.91; expand hl-line-mode to highlight-line-mode for readability

[Van Ly]

The sequence "hl" is easy to type but recalling its function after not
using  it a  while  takes  effort.  Seeing  "Hl-Line  mode enabled  in
current buffer" also takes effort to read.

In the spirit of "display-line-numbers-mode" can "highlight-line-mode"
be the full expansion for feedback and the expansion to "hl"?

Steps to reproduce
 . start "emacs -Q"
 . type three lines of "q"
 . on the middle line type "M-x hl" and TAB to use the completion

An improvement from my point of view
 . on the middle line type "hl" and TAB to use the completion
 . the completion expands what was "hl-line-mode" to "highlight-line-mode"

bug-gnu-emacs.text
Description: generated bug report