Added method documentation. (#68)

* Added method documentation.
* Updated actions to v4.

.github/workflows/R_CMD_check_Hades.yaml

@@ -45,7 +45,7 @@ jobs:
       CDM5_SQL_SERVER_USER: ${{ secrets.CDM5_SQL_SERVER_USER }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-r@v2
         with:
@@ -65,7 +65,7 @@ jobs:
 
       - name: Cache R packages
         if: runner.os != 'Windows'
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ env.R_LIBS_USER }}
           key: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-${{ hashFiles('.github/depends.Rds') }}
@@ -109,14 +109,14 @@ jobs:
 
       - name: Upload check results
         if: failure()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ runner.os }}-r${{ matrix.config.r }}-results
           path: check
 
       - name: Upload source package
         if: success() && runner.os == 'macOS' && github.event_name != 'pull_request' && github.ref == 'refs/heads/master'
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: package_tarball
           path: check/*.tar.gz
@@ -138,7 +138,7 @@ jobs:
 
     steps:
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0    
 
@@ -180,7 +180,7 @@ jobs:
           
       - name: Download package tarball
         if: ${{ env.new_version != '' }}
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v
         with:
           name: package_tarball