Fix formatting in README.md

ci/README.md

diff --git a/ci/README.md b/ci/README.md
index 23d9ea1..bb16f88 100644
--- a/ci/README.md
+++ b/ci/README.md
@@ -1,7 +1,7 @@
 ## Eigen CI infrastructure
 
 Eigen's CI infrastructure uses three stages:
-  1. A 'checkformat` stage to verify MRs satisfy proper formatting style, as
+  1. A `checkformat` stage to verify MRs satisfy proper formatting style, as
      defined by `clang-format`.
   2. A `build` stage to build the unit-tests.
   3. A `test` stage to run the unit-tests.