bug#9432: 24.0.50; doc string of `next-error-highlight'

[Drew Adams]

The doc string correctly describes the length of time of highlighting
for each of the values that does highlighting... EXCEPT for the value
`fringe-arrow'.  In that case the doc only says WHERE the
"highlighting"/indication occurs; it does not say UNTIL WHEN it occurs.
 
The doc string should say that the fringe indication is moved when some
other locus replaces it - just as it says this for a value of `t'.
 

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2011-08-29 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.5) --no-opt'