Update guided_onborading_sample_rule.toml (#2408)

changed name to "My First Rule"

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

(cherry picked from commit c6f5d47)

rules/cross-platform/guided_onborading_sample_rule.toml

@@ -1,7 +1,7 @@
 [metadata]
 creation_date = "2022/09/22"
 maturity = "production"
-updated_date = "2022/09/22"
+updated_date = "2022/11/22"
 min_stack_comments = "Guided Onboarding will be available in Elastic 8.6+"
 min_stack_version = "8.6.0"
 
@@ -33,7 +33,7 @@ index = [
 ]
 language = "kuery"
 license = "Elastic License v2"
-name = "My First Alert"
+name = "My First Rule"
 note = """ 
 This is a test alert.