Update Adapter Change Process to use main branch

Author: kbenzie

.github/workflows/e2e_nightly.yml

@@ -30,7 +30,6 @@ jobs:
     - name: Checkout UR
       uses: actions/checkout@v4
       with:
-        ref: adapters
         path: ur-repo
 
     - name: Checkout SYCL

.github/workflows/nightly.yml

@@ -17,9 +17,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-      # with-ref part to be removed after merging 'adapters' branch with 'main'
-      with:
-        ref: adapters
 
     - name: Install pip packages
       run: pip install -r third_party/requirements.txt

scripts/core/CONTRIB.rst

@@ -53,8 +53,8 @@ Adapter Change Process
 ======================
 
 1.  Create a pull request containing the adapter changes in the
-    `oneapi-src/unified-runtime`_ project targeting the `adapters
-    <https://github.com/oneapi-src/unified-runtime/tree/adapters>`_ branch.
+    `oneapi-src/unified-runtime`_ project targeting the `main
+    <https://github.com/oneapi-src/unified-runtime/tree/main>`_ branch.
 
 2.  Create a draft pull request in the `intel/llvm`_ project to take advantage
     of the pre-merge testing. Add any required implementation changes in