add CI check for zstd_manual before release

ensures it's properly updated

.github/workflows/dev-short-tests.yml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # tag=v4.1.1
-    - name: ensure zstd can be build with c89/c90 compilers (+ long long support + variadic macros)
+    - name: ensure zstd can be built with c89/c90 compilers (+ long long support + variadic macros)
       run: |
         make c89build V=1