main/php5: update secfixes comment for CVE-2018-5712

The fix for CVE-2018-5712 in 5.6.33 was incomplete and got finally fixed
in 5.6.36 together with a new CVE id (CVE-2018-10547).

Update secfixes comment and remove duplicate entry for CVE-2018-5712.

ref #11914
upstream ref: https://bugs.php.net/bug.php?id=76129

main/php5/APKBUILD

@@ -137,11 +137,11 @@ _peardir=/usr/share/pear
 #     - CVE-2018-14883
 #   5.6.36-r0:
 #     - CVE-2018-5712
+#     - CVE-2018-10547
 #   5.6.34-r0:
 #     - CVE-2018-7584
 #   5.6.33-r0:
 #     - CVE-2018-5711
-#     - CVE-2018-5712
 #   5.6.31-r0:
 #     - CVE-2017-9224
 #     - CVE-2017-9226