docs: fix nullability jsdoc (#731)

Author: Jason Kuhrt

src/definitions/nonNull.ts

@@ -22,18 +22,14 @@ withNexusSymbol(NexusNonNullDef, NexusTypes.NonNull)
  *
  * Modify a type to be Non-Null.
  *
- * In Nexus input postition types are non-null by default so this has no use for them (until you've changed
- * the default). On the other hand output postition types are nullable by default so use this to modify them
- * (until you've changed the default).
+ * In Nexus input and output position types are nullable by default so use this to modify them so long as
+ * you've not changed the non-null defaults for one or both positions.
  *
  * If you find yourself using this a large majority of the time then consider changing your nullability defaults.
  *
  * @example
  *   objectType({
  *     name: 'User',
- *     nonNullDefaults: {
- *       inputs: false,
- *     },
  *     definition(t) {
  *       t.field('id', {
  *         type: nonNull('ID'),

src/definitions/nullable.ts

@@ -22,16 +22,16 @@ withNexusSymbol(NexusNullDef, NexusTypes.Null)
  *
  * Remove the Non-Null wrapper from a type, if present.
  *
- * In Nexus input postition types are non-null by default so this is useful to modify them (until you've
- * changed the default). On the other hand output postition types are nullable by default so this has no use
- * for them (until you've changed the default).
+ * In Nexus input and output position types are nullable by default so this has ***no use*** until you've
+ * changed the non-null defaults for one or both positions.
  *
  * If you find yourself using this a large majority of the time then consider changing your nullability defaults.
  *
  * @example
  *   objectType({
  *     name: 'User',
  *     nonNullDefaults: {
+ *       inputs: true,
  *       outputs: true,
  *     },
  *     definition(t) {