fix: update open so the examples render correctly in CLI Ref

Author: jshackell-sfdc

messages/open.json

@@ -1,11 +1,11 @@
 {
   "description": "open your default scratch org, or another specified org\nTo open a specific page, specify the portion of the URL after \"https://MyDomainName.my.salesforce.com/\" as --path.\nFor example, specify \"--path lightning\" to open Lightning Experience, or specify \"--path /apex/YourPage\" to open a Visualforce page.\nTo generate a URL but not launch it in your browser, specify --urlonly.\nTo open in a specific browser, use the --browser parameter. Supported browsers are \"chrome\", \"edge\", and \"firefox\". If you don't specify --browser, the org opens in your default browser.",
   "examples": [
-    "sfdx force:org:open",
-    "sfdx force:org:open -u [email protected]",
-    "sfdx force:org:open -u MyTestOrg1",
-    "sfdx force:org:open -r -p lightning",
-    "sfdx force:org:open -u [email protected] -b firefox"
+    "$ sfdx force:org:open",
+    "$ sfdx force:org:open -u [email protected]",
+    "$ sfdx force:org:open -u MyTestOrg1",
+    "$ sfdx force:org:open -r -p lightning",
+    "$ sfdx force:org:open -u [email protected] -b firefox"
   ],
   "browser": "browser where the org opens",
   "cliPath": "navigation URL path",