scripts: package_has_missing_deps: Fix typo in script docstring

BUG=none
TEST=none

Change-Id: I1f5e5c12897c45ecf4a4bcf11955b6b85362fd82
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4894169
Reviewed-by: Tim Bain <tbain@google.com>
Commit-Queue: Tim Bain <tbain@google.com>
Auto-Submit: Nicholas Bishop <nicholasbishop@google.com>
Tested-by: Nicholas Bishop <nicholasbishop@google.com>
diff --git a/scripts/package_has_missing_deps.py b/scripts/package_has_missing_deps.py
index f61737c..191c8ba 100644
--- a/scripts/package_has_missing_deps.py
+++ b/scripts/package_has_missing_deps.py
@@ -8,7 +8,7 @@
 BOARD environment variable into account.
 
 Example:
-    package_hash_missing_deps.py --board=amd64-generic --match \
+    package_has_missing_deps.py --board=amd64-generic --match \
         chromeos-base/cryptohome
 """