cmd ref: remove prereq sentence from get --rev option

per iterative#936 (review)

Author: jorgeorpinel

public/static/docs/command-reference/get.md

@@ -58,14 +58,13 @@ name.
   an existing directory is specified, then the output will be placed inside of
   it.
 
-- `--rev` - `url` is expected to represent a Git repository for this option to
-  have an effect. Specific
+- `--rev` - specific
   [Git revision](https://git-scm.com/book/en/v2/Git-Internals-Git-References)
   (such as a branch name, a tag, or a commit hash) of the repository to download
   the file or directory from. The tip of the default branch is used by default
   when this option is not specified.
 
-- `-h`, `--help` - prints the usage/help message, and exit.
+- `-h`, `--help` - prints the usage/help message, and exit.f
 
 - `-q`, `--quiet` - do not write anything to standard output. Exit with 0 if no
   problems arise, otherwise 1.