[Jmeter Wiki] Update of "ReleaseCreation" by Milamber

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The "ReleaseCreation" page has been changed by Milamber:
https://wiki.apache.org/jmeter/ReleaseCreation?action=diff&rev1=67&rev2=68

Comment:
Update the process to include the META file for https://checker.apache.org

  }}}
     * Edit HEADER.html to modifiy with new version number
     * If necessary, add your GPG public key to KEYS
+    * If necessary, update the META file with your GPG key id (if you act as the release manager for the first time. Please visit https://checker.apache.org/doc/README.html )
+       * The META file needs to be signed by the PMC Chair of project with this command:
+ {{{
+ gpg -u emailOfPmcChairJMeter@apache.org --armor --output META.asc --detach-sig META
+ }}}
+       * To verify the good signature, use this command:
+ {{{
+ $ gpg --verify META.asc META
+ 
+ gpg: Signature made mar. 12 sept. 2017 18:05:19 WEST
+ gpg:                using RSA key C4923F9ABFB2F1A06F08E88BAC214CAA0612B399
+ gpg:                issuer "milamber@apache.org"
+ gpg: Good signature from "Milamber (ASF) <mi...@apache.org>" [ultimate]
+ gpg:                 aka "Milamber (Milamberspace) <mi...@gmail.com>" [ultimate]
+ }}}
     * Commit with svn
  {{{
  svn commit -m "JMeter 3.2 release - Prepare update site" dist-jmeter