(doc) Fix typo in choco install example

Author: dmmqz

src/content/docs/en-us/choco/commands/install.mdx

@@ -144,7 +144,7 @@ Alternative to PackageName. This is a list of packages in an xml manifest for Ch
 This specifies the source is Ruby Gems and that we are installing a
  gem. If you do not have ruby installed prior to running this command,
  the command will install that first.
- e.g. `choco install compass -source ruby`
+ e.g. `choco install compass --source ruby`
 
 ### Cygwin
 This specifies the source is Cygwin and that we are installing a cygwin