Update Documentation/SwiftlyDocs.docc/swiftly-cli-reference.md

Co-authored-by: Joseph Heck <[email protected]>

Author: cmcgee1024

Documentation/SwiftlyDocs.docc/swiftly-cli-reference.md

@@ -57,7 +57,7 @@ Install whatever toolchain is currently selected, such as the the one in the .sw
 
     $ swiftly install
 
-NOTE: Toolchains are downloaded to a temporary file that is later cleaned up by the installation process. If these files are too big for your usual temporary directory you can choose another location by setting the `TMPDIR` environment variable.
+NOTE: Swiftly downloads toolchains to a temporary file that it later cleans during its installation process. If these files are too big for your system temporary directory, set another location by setting the `TMPDIR` environment variable.
 
     $ TMPDIR=/large/file/tmp/storage swiftly install latest