Update index.bs

Co-authored-by: Mathias Bynens <[email protected]>

Author: OrKoN

index.bs

@@ -1842,7 +1842,7 @@ The <dfn export for=commands>browser.createPartition</dfn> command creates a sto
 
 #### The browser.closePartition Command #### {#command-browser-closePartition}
 
-The <dfn export for=commands>browser.closePartition</dfn> command closes the partition and all browsing contexts in it without running before unload handlers.
+The <dfn export for=commands>browser.closePartition</dfn> command closes the partition and all browsing contexts in it without running <code>beforeunload</code> handlers.
 
 <dl>
    <dt>Command Type</dt>