docs/man/git-lfs-migrate: make examples less confusing

When invoking git lfs migrate --no-rewrite, we take a list of files, not
a list of patterns. This differs from other situations, and the examples
in the man page don't make this clear, resulting in confusion on the
part of users. Improve the example by making the example commit message
explain the situation a bit better.

docs/man/git-lfs-migrate.1.ronn

@@ -260,7 +260,8 @@ Note: This will require a force push to any existing Git remotes.
 ### Migrate without rewriting local history
 
 You can also migrate files without modifying the existing history of your
-repository:
+repository. Note that in the examples below, files in subdirectories are not
+included because they are not explicitly specified.
 
 Without a specified commit message:
 
@@ -271,8 +272,9 @@ $ git lfs migrate import --no-rewrite test.zip *.mp3 *.psd
 With a specified commit message:
 
 ```
-$ git lfs migrate import --no-rewrite -m "Import .zip, .mp3, .psd files" \
-  test.zip *.mpd *.psd
+$ git lfs migrate import --no-rewrite \
+  -m "Import test.zip, .mp3, .psd files in root of repo" \
+  test.zip *.mp3 *.psd
 ```
 
 ## SEE ALSO