Fix typo in new repo example and expand help

src/example/create-new-repo-from-subdirectory.md

@@ -6,10 +6,12 @@ Useful if you want to pull a directory, and its commit history, out into a new r
 git clone _.git
 
 # Get only the files and commits impacting a particular directory.
+# This should be the name of the directory only; if using PowerShell or the like make sure it does not include path information.
+# <branchName> is the name of the default branch, generally master.
 git filter-branch --prune-empty --subdirectory-filter <pathToDirectory> <branchName>
 
 # View and then update your remotes with the new repo location.
-git remove -v
+git remote -v
 git remote set-url origin _.git
 
 git push -u origin <branchName>