top: include the '5' toggle on the primary help screen

When the p/e-cores support (via the '5' key) was added
in the patch referenced below, I intentionally omitted
that key from the top primary help screen. This seemed
appropriate since it only applied to select Intel cpus
and, besides, that screen was getting kind of crowded.

[ it remains an objective to fit on a 80x24 terminal ]

Upon reflection, I found a way to squeeze it into that
help screen and have decided to included it. Hopefully
its presence will encourage use of top's new provision
on any Intel platforms that distinguish between cores.

Reference(s):
Sep, 2022 - exploit p/e-cores provision
commit 00f5c74b1b

Signed-off-by: Jim Warner <james.warner@comcast.net>

NEWS

@@ -3,6 +3,7 @@ procps-ng-NEXT
   * docs: Don't install English manpages twice
   * ps: c flag shows command name again                    Debian #1026326
   * skill: Match on -p again                               Debian #1025915
+  * top: E/P-core toggle ('5' key) added to help
   * vmstat: Referesh memory statistics                     Debian #1027963
 
 procps-ng-4.0.2
@@ -10,7 +11,7 @@ procps-ng-4.0.2
   * library revision - 0:1:0
     Handle absent 'core_id' in /proc/cpuinfo
   * w: Show time with D_TIME_BITS=64 on 32bit env          issue #256
- 
+
 procps-ng-4.0.1
 ---------------
   * library

src/top/top_nls.c

@@ -663,8 +663,8 @@ static void build_uniq_nlstab (void) {
       "Window ~1%s~6: ~1Cumulative mode ~3%s~2.  ~1System~6: ~1Delay ~3%.1f secs~2; ~1Secure mode ~3%s~2.\n"
       "\n"
       "  Z~5,~1B~5,E,e   Global: '~1Z~2' colors; '~1B~2' bold; '~1E~2'/'~1e~2' summary/task memory scale\n"
-      "  l,t,m,I   Toggle: '~1l~2' load avg; '~1t~2' task/cpu; '~1m~2' memory; '~1I~2' Irix mode\n"
-      "  0,1,2,3,4 Toggle: '~10~2' zeros; '~11~2/~12~2/~13~2' cpu/numa views; '~14~2' cpus two abreast\n"
+      "  l,t,m,I,0 Toggle: '~1l~2' load avg; '~1t~2' task/cpu; '~1m~2' memory; '~1I~2' Irix; '~10~2' zeros\n"
+      "  1,2,3,4,5 Toggle: '~11~2/~12~2/~13~2' cpu/numa views; '~14~2' cpus abreast; '~15~2' P/E-cores\n"
       "  f,X       Fields: '~1f~2' add/remove/order/sort; '~1X~2' increase fixed-width fields\n"
       "\n"
       "  L,&,<,> . Locate: '~1L~2'/'~1&~2' find/again; Move sort column: '~1<~2'/'~1>~2' left/right\n"