Short-hand flags (#1378)

* typo fixes

* Change signature to take in short-hand flags

* update help information

* Parse short-hand flags as their long counterparts

* lints

* Modified a couple tests to use shorthand flags

crates/nu_plugin_fetch/src/nu/mod.rs

@@ -15,7 +15,7 @@ impl Plugin for Fetch {
                 SyntaxShape::Path,
                 "the URL to fetch the contents from",
             )
-            .switch("raw", "fetch contents as text rather than a table")
+            .switch("raw", "fetch contents as text rather than a table", Some('r'))
             .filter())
     }