[Rule Tuning] Tag Categorization Updates (#380)

* Add new categorization tags

* Change updated_date to 2020/10/26

Co-authored-by: Ross Wolf <31489089+rw-access@users.noreply.github.com>, @bm11100

rules/linux/discovery_kernel_module_enumeration.toml

@@ -2,7 +2,7 @@
 creation_date = "2020/04/23"
 ecs_version = ["1.6.0"]
 maturity = "production"
-updated_date = "2020/08/03"
+updated_date = "2020/10/26"
 
 [rule]
 author = ["Elastic"]
@@ -25,7 +25,7 @@ name = "Enumeration of Kernel Modules"
 risk_score = 47
 rule_id = "2d8043ed-5bda-4caf-801c-c1feb7410504"
 severity = "medium"
-tags = ["Elastic", "Linux"]
+tags = ["Elastic", "Host", "Linux", "Threat Detection", "Discovery"]
 type = "query"
 
 query = '''