graphQl-912: optimized customer input schema

app/code/Magento/CustomerGraphQl/etc/schema.graphqls

@@ -60,10 +60,10 @@ input CustomerInput {
     middlename: String @doc(description: "The customer's middle name")
     lastname: String @doc(description: "The customer's family name")
     suffix: String @doc(description: "A value such as Sr., Jr., or III")
-    email: String @doc(description: "The customer's email address. Required")
+    email: String! @doc(description: "The customer's email address. Required")
     dob: String @doc(description: "The customer's date of birth")
-    taxvat: String @doc(description: "The customer's Tax/VAT number (for corporate customers)")
-    gender: Int @doc(description: "The customer's gender(Male - 1, Female - 2)")
+    taxvat: String @doc(description: "The customer's Value-added tax (VAT) number (for corporate customers)")
+    gender: Int @doc(description: "The customer's gender (Male - 1, Female - 2)")
     password: String @doc(description: "The customer's password")
     is_subscribed: Boolean @doc(description: "Indicates whether the customer is subscribed to the company's newsletter")
 }
@@ -88,11 +88,11 @@ type Customer @doc(description: "Customer defines the customer name and address
     default_billing: String @doc(description: "The ID assigned to the billing address")
     default_shipping: String @doc(description: "The ID assigned to the shipping address")
     dob: String @doc(description: "The customer's date of birth")
-    taxvat: String @doc(description: "The customer's Tax/VAT number (for corporate customers)")
+    taxvat: String @doc(description: "The customer's Value-added tax (VAT) number (for corporate customers)")
     id: Int @doc(description: "The ID assigned to the customer")
     is_subscribed: Boolean @doc(description: "Indicates whether the customer is subscribed to the company's newsletter") @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\IsSubscribed")
     addresses: [CustomerAddress] @doc(description: "An array containing the customer's shipping and billing addresses") @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\CustomerAddresses")
-    gender: Int @doc(description: "The customer's gender(Male - 1, Female - 2)")
+    gender: Int @doc(description: "The customer's gender (Male - 1, Female - 2)")
 }
 
 type CustomerAddress @doc(description: "CustomerAddress contains detailed information about a customer's billing and shipping addresses"){
@@ -112,7 +112,7 @@ type CustomerAddress @doc(description: "CustomerAddress contains detailed inform
     middlename: String @doc(description: "The middle name of the person associated with the shipping/billing address")
     prefix: String @doc(description: "An honorific, such as Dr., Mr., or Mrs.")
     suffix: String @doc(description: "A value such as Sr., Jr., or III")
-    vat_id: String @doc(description: "The customer's Tax/VAT number (for corporate customers)")
+    vat_id: String @doc(description: "The customer's Value-added tax (VAT) number (for corporate customers)")
     default_shipping: Boolean @doc(description: "Indicates whether the address is the default shipping address")
     default_billing: Boolean @doc(description: "Indicates whether the address is the default billing address")
     custom_attributes: [CustomerAddressAttribute] @doc(description: "Address custom attributes")