fix TOC of CONTRIBUTING.md

Author: Yuvaraj Kakaraparthi

CONTRIBUTING.md

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-- [Contributing Guidelines](#contributing-guidelines)
-    - [Contributor License Agreements](#contributor-license-agreements)
-    - [Finding Things That Need Help](#finding-things-that-need-help)
-    - [Contributing a Patch](#contributing-a-patch)
-    - [Documentation changes](#documentation-changes)
-    - [Releases](#releases)
-    - [Proposal process (CAEP)](#proposal-process-caep)
-    - [Triaging E2E test failures](#triaging-e2e-test-failures)
-    - [Reviewing a Patch](#reviewing-a-patch)
-    - [Reviews](#reviews)
-      - [Approvals](#approvals)
-    - [Backporting a Patch](#backporting-a-patch)
-    - [Features and bugs](#features-and-bugs)
-    - [Experiments](#experiments)
-    - [Breaking Changes](#breaking-changes)
-    - [API conventions](#api-conventions)
-      - [Optional vs. Required](#optional-vs-required)
-        - [Example](#example)
-        - [Exceptions](#exceptions)
-      - [CRD additionalPrinterColumns](#crd-additionalprintercolumns)
-    - [Google Doc Viewing Permissions](#google-doc-viewing-permissions)
-    - [Issue and Pull Request Management](#issue-and-pull-request-management)
-    - [Contributors ladder](#contributors-ladder)
+- [Contributor License Agreements](#contributor-license-agreements)
+- [Finding Things That Need Help](#finding-things-that-need-help)
+- [Versioning](#versioning)
+  - [Codebase and Go Modules](#codebase-and-go-modules)
+    - [Backporting a patch](#backporting-a-patch)
+  - [APIs](#apis)
+  - [CLIs](#clis)
+- [Branches](#branches)
+  - [Support and guarantees](#support-and-guarantees)
+- [Contributing a Patch](#contributing-a-patch)
+- [Documentation changes](#documentation-changes)
+- [Releases](#releases)
+- [Proposal process (CAEP)](#proposal-process-caep)
+- [Triaging E2E test failures](#triaging-e2e-test-failures)
+- [Reviewing a Patch](#reviewing-a-patch)
+- [Reviews](#reviews)
+  - [Approvals](#approvals)
+- [Features and bugs](#features-and-bugs)
+- [Experiments](#experiments)
+- [Breaking Changes](#breaking-changes)
+- [API conventions](#api-conventions)
+  - [Optional vs. Required](#optional-vs-required)
+    - [Example](#example)
+    - [Exceptions](#exceptions)
+  - [CRD additionalPrinterColumns](#crd-additionalprintercolumns)
+- [Google Doc Viewing Permissions](#google-doc-viewing-permissions)
+- [Issue and Pull Request Management](#issue-and-pull-request-management)
+- [Contributors Ladder](#contributors-ladder)
 
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