Update runtime.rst

typo PHP-PM:PHP-FPM

Author: morrsky

components/runtime.rst

@@ -2,7 +2,7 @@ The Runtime Component
 =====================
 
     The Runtime Component decouples the bootstrapping logic from any global state
-    to make sure the application can run with runtimes like PHP-PM, ReactPHP,
+    to make sure the application can run with runtimes like PHP-FPM, ReactPHP,
     Swoole, etc. without any changes.
 
 Installation