Add bug report and documentation improvement templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: "Bug Report"
+description: "Report an issue with the PHP documentation"
+labels: ["bug"]
+
+body:
+  - type: input
+    id: affected-page
+    attributes:
+      label: "Affected page"
+      description: "Provide the URL or file path of the affected documentation page."
+      placeholder: "e.g., https://www.php.net/manual/en/function.strlen.php"
+    validations:
+      required: true
+
+  - type: textarea
+    id: issue-description
+    attributes:
+      label: "Issue description"
+      description: "Describe the bug, including incorrect behavior, broken links, or missing content."
+      placeholder: "Describe what's wrong or missing on the page."
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: "Steps to reproduce"
+      description: "Explain how to reproduce the issue."
+      placeholder: |
+        1. Go to the page
+        2. Describe the actions
+        3. Explain the expected behavior
+    validations:
+      required: false
+
+  - type: textarea
+    id: suggested-fix
+    attributes:
+      label: "Suggested fix"
+      description: "Provide corrections or relevant references if possible."
+      placeholder: "e.g., link to correct behavior or suggested text/code."
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/documentation-improvement.yml

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+name: "Documentation Improvement"
+description: "Suggest an improvement for the PHP documentation"
+labels: ["enhancement"]
+
+body:
+  - type: input
+    id: affected-page
+    attributes:
+      label: "Affected page"
+      description: "Provide the URL or file path of the documentation to improve."
+      placeholder: "e.g., https://www.php.net/manual/en/function.strlen.php"
+    validations:
+      required: true
+
+  - type: textarea
+    id: current-issue
+    attributes:
+      label: "Current issue"
+      description: "Explain what is wrong or lacking, such as outdated info, missing examples, or unclear explanations."
+      placeholder: "Explain why the current documentation needs improvement."
+    validations:
+      required: true
+
+  - type: textarea
+    id: suggested-improvement
+    attributes:
+      label: "Suggested improvement"
+      description: "Provide updated content, better examples, or clarifications."
+      placeholder: "Share your proposed improvement."
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: "Additional context (optional)"
+      description: "Provide references, links, or examples from official or relevant sources."
+      placeholder: "Optional references or further explanation."
+    validations:
+      required: false