fixup no vars in 'on:' ... on gha

Author: c2main

.github/workflows/docs.yml

@@ -9,7 +9,7 @@ on:
     branches:
     - main
     paths:
-      - "${{ env.context }}/**"
+      - '/docs/**'
   push:
     branches:
     - main

.github/workflows/latex-pdftocairo.yml

@@ -9,7 +9,7 @@ on:
     branches:
     - main
     paths:
-      - "${{ env.context }}/**"
+      - '/docs/tikz/**'
   push:
     branches:
     - main