Use _work_ isntead of *word*

Change done by formatting the file with Zed markdown extension. Not sure
why it is better, but using this makes it easier for me to keep the file
nicely formatted.

Signed-off-by: Nir Soffer <[email protected]>

Author: nirs

README.md

@@ -161,7 +161,7 @@ This installs binaries using `PREFIX=/opt/socket_vmnet`:
 You can customize the install location using the `PREFIX` environment variable,
 however, it is highly recommended to set the prefix to a directory that can be
 only written by the root. Note that `/usr/local/bin` is sometimes chowned for a
-non-admin user, so `/usr/local` is *not* an appropriate prefix.
+non-admin user, so `/usr/local` is _not_ an appropriate prefix.
 
 Run the following command to start the daemon: