README.md: Update/Fix documentation section
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/README.md b/README.md
index 171323c..1e07fd8 100644
--- a/README.md
+++ b/README.md
@@ -22,9 +22,8 @@
To generate a local copy of the library documentation in HTML format, tailored to your compile-time configuration:
1. Make sure that [Doxygen](http://www.doxygen.nl/) is installed.
-1. Run `mkdir /path/to/build_dir && cd /path/to/build_dir`
-1. Run `cmake /path/to/mbedtls/source`
-1. Run `make apidoc`
+1. Run `cmake -B /path/to/build_dir /path/to/mbedtls/source`
+1. Run `cmake --build /path/to/build_dir --target mbedtls-apidoc`
1. Browse `apidoc/index.html` or `apidoc/modules.html`.
For other sources of documentation, see the [SUPPORT](SUPPORT.md) document.