docs(@angular-devkit/build-angular): add missing period in include …

…description

(cherry picked from commit 378ec0b)

packages/angular_devkit/build_angular/src/builders/karma/schema.json

@@ -70,7 +70,7 @@
       "items": {
         "type": "string"
       },
-      "description": "Globs of files to include, relative to workspace or project root. \nThere are 2 special cases:\n - when a path to directory is provided, all spec files ending \".spec.@(ts|tsx)\" will be included\n - when a path to a file is provided, and a matching spec file exists it will be included instead"
+      "description": "Globs of files to include, relative to workspace or project root. \nThere are 2 special cases:\n - when a path to directory is provided, all spec files ending \".spec.@(ts|tsx)\" will be included\n - when a path to a file is provided, and a matching spec file exists it will be included instead."
     },
     "sourceMap": {
       "description": "Output source maps for scripts and styles. For more information, see https://angular.io/guide/workspace-config#source-map-configuration.",