Some copy edits

* doc/emacs/maintaining.texi (Switching Projects)
(Project File Commands): Copy edits.

* etc/NEWS: Same.
1 job for scratch/project-switching in 90 minutes (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
failed #6018
test-all

01:30:00

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
make -C test check-expensive
make[1]: Entering directory '/builds/emacs/emacs/test'
rm -f ./*.tmp
make[2]: Entering directory '/builds/emacs/emacs/test'
make[3]: Entering directory '/builds/emacs/emacs/test'
ELC lisp/net/tramp-tests.elc
GEN lisp/net/tramp-tests.log
Pulling docker image gitlab/gitlab-runner-helper:x86_64-f100a208 ...
ERROR: Job failed: execution took longer than 1h30m0s seconds