Fix Elisp manual entry for format-spec

* doc/lispref/text.texi (Interpolated Strings): Fix typos.  Don't
document modifier for default space padding as it's redundant and
inconsistent with the docstring and implementation of format-spec.
1 job for emacs-27 in 35 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
failed #6094


Name Stage Failure
test-all Test
make[1]: Leaving directory '/builds/emacs/emacs/lisp'
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
ERROR: Job failed: exit code 137