doc: README.md - format admonition

Format an admonition correctly. This commit is a prelude to a cleanup of
a recent addition to README.md.

Signed-off-by: Zac Dover <zac.dover@proton.me>

diff --git a/README.md b/README.md
index 1ca46f364fa6c9e23654f31f5dcd77a62e9d21d8..5a5ac07206d4dc4932d03faed7a06c2a0794be28 100644 (file)
--- a/README.md
+++ b/README.md
@@ -95,7 +95,7 @@ To build Ceph, follow this procedure:
 
        ninja -j3
 
-   > [IMPORTANT]
+   > [!IMPORTANT]
    >
    > [Ninja](https://ninja-build.org/) is the build system used by the Ceph
    > project to build test builds.  The number of jobs used by `ninja` is