[Users] Updated Release Notes for 8.7.3

[Jorge de la Cruz]

Hi guys, 
It seems I've missed two items which were inside 8.7.3, plus the others, but this two were really commented every time in the Forums: 
[ https://bugzilla.zimbra.com/show_bug.cgi?id=107058 | 107058 ] 
	Fix "Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/\${ <-- HERE zimbra_home}/ at /opt/zimbra/libexec/zmupgrade.pm" for UBUNUTU16 
[ https://bugzilla.zimbra.com/show_bug.cgi?id=106379 | 106379 ] 
	"/opt/zimbra/libexec/zmfixperms --verbose --extended" changing /opt/zimbra/common/sbin permission to zimbra:zimbra 

Found the entire Release Notes here: 


    * [ https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.3 | https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.3 ] 

Best regards 
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