Merge pull request #7 from sidick/docs-ci-note

README: note CI skips build jobs for docs-only changes

Author: sidick

README.md

@@ -107,7 +107,7 @@ Testing
 Continuous integration (`.github/workflows/ci.yml`) runs the unit tests
 warnings-as-error across gcc/clang, Linux/macOS and the compile-time option
 variants, plus the corpus and unit tests under ASan/UBSan and a short fuzz
-smoke test.
+smoke test. These build jobs are skipped for documentation-only changes.
 
 Several options can be adjusted at compile time by passing additional arguments
 to `make`. See [Compile-time options](#compile-time-options) section below for details.