minor updates

.github/workflows/presubmit.yml

@@ -7,6 +7,7 @@ on: [push, pull_request]
 
 jobs:
   build:
+    name: Build all specs
     runs-on: ubuntu-latest
 
     steps:
@@ -30,17 +31,17 @@ jobs:
         run: |
           git describe --tags --dirty
 
-      - name: Generate all specs
+      - name: Generate core specs
         run: |
-          make -O -j 5 api c env ext cxx4opencl
+          make -O -j5 api c env ext cxx4opencl
           
       - name: Generate extension specs
         run: |
           make extensionshtml
 
       - name: Generate reference pages
         run: |
-          make -O -j 5 manhtmlpages
+          make -O -j manhtmlpages
 
       - name: Validate XML
         run: |