Update documentation.yml

Minor fixes

Author: DeveloperPaul123

.github/workflows/documentation.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - "*"
+  workflow_dispatch:
 
 env:
   CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
@@ -23,6 +24,7 @@ jobs:
       - name: Install dependencies
         run: |
           choco install doxygen.install -y
+          choco install Graphviz -y
 
       - name: Build
         run: |