Updated templates for updated Edition tiers

Removed a reference to Starter
Fixed two links to the product handbook four-tiers sublink
Signed-off-by: Raimund Hook <raimund.hook@exfo.com>

.gitlab/issue_templates/Basic Proposal.md

@@ -6,6 +6,6 @@
 
 <!-- Consider adding related issues and epics to this issue. You can also reference the Feature Proposal Template (https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Feature%20proposal.md) for additional details to consider adding to this issue. Additionally, as a data oriented organization, when your feature exits planning breakdown, consider adding the `What does success look like, and how can we measure that?` section.
 
-/label ~"group::" ~"section::"  ~"Category::" ~"GitLab Core"/~"GitLab Starter"/~"GitLab Premium"/~"GitLab Ultimate" 
+/label ~"group::" ~"section::"  ~"Category::" ~"GitLab Core"/~"GitLab Premium"/~"GitLab Ultimate" 
 
 -->

.gitlab/issue_templates/Feature proposal.md

@@ -97,7 +97,7 @@ Create tracking issue using the the Snowplow event tracking template. See https:
 ### What is the type of buyer?
 
 <!-- What is the buyer persona for this feature? See https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/buyer-persona/
-In which enterprise tier should this feature go? See https://about.gitlab.com/handbook/product/pricing/#four-tiers -->
+In which enterprise tier should this feature go? See https://about.gitlab.com/handbook/product/pricing/#three-tiers -->
 
 ### Is this a cross-stage feature?
 

.gitlab/issue_templates/Lean Feature Proposal.md

@@ -96,7 +96,7 @@ Define both the success metrics and acceptance criteria. Note that success metri
 ### What is the type of buyer?
 
 What is the buyer persona for this feature? See https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/buyer-persona/
-In which enterprise tier should this feature go? See https://about.gitlab.com/handbook/product/pricing/#four-tiers
+In which enterprise tier should this feature go? See https://about.gitlab.com/handbook/product/pricing/#three-tiers
 
 ### Is this a cross-stage feature?