Fix typo and do not spellcheck the json plugins testdata

Author: elpaso

python/pyplugin_installer/qgsplugindependenciesdialog.py

@@ -34,7 +34,7 @@ def __init__(self, plugin_name, to_install, to_upgrade, not_found, parent=None):
         :type to_install: list
         :param to_upgrade: list of plugin IDs that needs to be upgraded
         :type to_upgrade: list
-        :param not_found: list of plugin IDs that are not found (unvailable)
+        :param not_found: list of plugin IDs that are not found (unavailable)
         :type not_found: list
         :param parent: parent object, defaults to None
         :param parent: QWidget, optional

scripts/spell_check/.agignore

@@ -64,4 +64,5 @@ tests/testdata/qgis_server_accesscontrol/project.qgs
 tests/testdata/qgis_server/ets-wms13/project.qgs
 tests/testdata/layouts/sample_project.qgs
 tests/testdata/layouts/2x_template_attributetable.qpt
+tests/testdata/plugindependencies_data.json