flashrom.8.tmpl: Clarify man entries for -w/-v/-x

This change adds follow up changes to the man page:
 - Explain (-) argument for -w/-v operations
 - Expand on region name handling of -x operation

Also updates cli_classic.c to match with --help output.

flashrom-stable:
* Fixed -v description (reads from stdin)
* s/ B/.B/

Change-Id: I0cba593da3926c8587027789f4e1e89a2329ca7f
Signed-off-by: Daniel Campello <campello@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/62794
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71556
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/cli_classic.c b/cli_classic.c
index be2f86c..7f6887c 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -45,9 +45,9 @@
 	printf(" -h | --help                        print this help text\n"
 	       " -R | --version                     print version (release)\n"
 	       " -r | --read <file>                 read flash and save to <file>\n"
-	       " -w | --write <file|->              write <file> or the content provided\n"
+	       " -w | --write (<file>|-)            write <file> or the content provided\n"
 	       "                                    on the standard input to flash\n"
-	       " -v | --verify <file|->             verify flash against <file>\n"
+	       " -v | --verify (<file>|-)           verify flash against <file>\n"
 	       "                                    or the content provided on the standard input\n"
 	       " -E | --erase                       erase flash memory\n"
 	       " -V | --verbose                     more verbose output\n"