Update messages/webapp.dev.md

Co-authored-by: Juliet Shackell <63259011+jshackell-sfdc@users.noreply.github.com>

Author: deepu-mungamuri94

messages/webapp.dev.md

@@ -132,7 +132,7 @@ Proxy server is running. Stop it by running "SFDX: Close Live Preview" from the
 
 # info.server-running-target-both
 
-Dev & proxy servers are running. Stop them by running "SFDX: Close Live Preview" from the VS Code command palette.
+Dev and proxy servers are running. Stop them by running "SFDX: Close Live Preview" from the VS Code command palette.
 
 # info.dev-server-healthy