Adding two false positive rules

One for Go, where the GPLv2 licenses is mentioned in the context of GCC and
one for pycryptodomex where the GPL license is mentioned in the context of
a website.

Signed-off-by: Gergely Csatari <gergely.csatari@nokia.com>
Co-authored-by: Philippe Ombredanne <pombredanne@aboutcode.org>

Author: CsatariGergely

src/licensedcode/data/rules/false-positive_830.RULE

@@ -0,0 +1,5 @@
+---
+is_false_positive: yes
+notes: This is only a mention of GLPv2 and it is related to GCC
+---
+that is the last GPLv2 version of GCC,

src/licensedcode/data/rules/false-positive_831.RULE

@@ -0,0 +1,5 @@
+---
+is_false_positive: yes
+notes: This is a mention of GPL in relation to a website and not the code in question
+---
+(An updated version on the author's website came with a license that contained a GPL-incompatible advertising clause.)