docs: description of minimal option consistent across commands

Author: jbogarthyde

packages/schematics/angular/application/schema.json

@@ -77,7 +77,7 @@
       "description": "When true, does not add dependencies to the \"package.json\" file."
     },
     "minimal": {
-      "description": "When true, creates a bare-bones project without any testing frameworks and should be used for learning purposes.",
+      "description": "When true, creates a bare-bones project without any testing frameworks. (Use for learning purposes only.)",
       "type": "boolean",
       "default": false
     },

packages/schematics/angular/ng-new/schema.json

@@ -144,7 +144,7 @@
       "default": true
     },
     "minimal": {
-      "description": "When true, creates a project without any testing frameworks. (Use for learning purposes only).",
+      "description": "When true, creates a project without any testing frameworks. (Use for learning purposes only.)",
       "type": "boolean",
       "default": false
     }

packages/schematics/angular/workspace/schema.json

@@ -70,7 +70,7 @@
       }
     },
     "minimal": {
-      "description": "When true, creates a workspace without any testing frameworks and should be used for learning.",
+      "description": "When true, creates a workspace without any testing frameworks. (Use for learning purposes only.)",
       "type": "boolean",
       "default": false
     }