Change rethrow(e) to rethrow() (#2736)

* Change `rethrow(e)` to `rethrow()`

* No need to capture the error in the e variable

Author: DilumAluthge

src/deploydocs.jl

@@ -391,14 +391,14 @@ function git_push(
         run(`$(git()) remote add upstream $upstream`)
         try
             run(`$(git()) fetch upstream`)
-        catch e
+        catch
             @error """
             Git failed to fetch $upstream
             This can be caused by a DOCUMENTER_KEY variable that is not correctly set up.
             Make sure that the environment variable is properly set up as a Base64-encoded string
             of the SSH private key. You may need to re-generate the keys with DocumenterTools.
             """
-            rethrow(e)
+            rethrow()
         end
 
         try