Fix typo in testing.md (#12)

Author: devnll

1.x/spark-paddle/testing.md

@@ -34,7 +34,7 @@ public function withSubscription($planId = null)
 }
 ```
 
-Once you have define the state method, you may use it when creating models via your factory:
+Once you have defined the state method, you may use it when creating models via your factory:
 
 ```php
 $user = User::factory()->withSubscription($planId = 1000)->create();

1.x/spark-stripe/testing.md

@@ -37,7 +37,7 @@ public function withSubscription($planId = null)
 }
 ```
 
-Once you have define the state method, you may use it when creating models via your factory:
+Once you have defined the state method, you may use it when creating models via your factory:
 
 ```php
 $user = User::factory()->withSubscription('plan_id')->create();

2.x/spark-paddle/testing.md

@@ -34,7 +34,7 @@ public function withSubscription($planId = null)
 }
 ```
 
-Once you have define the state method, you may use it when creating models via your factory:
+Once you have defined the state method, you may use it when creating models via your factory:
 
 ```php
 $user = User::factory()->withSubscription($planId = 1000)->create();

2.x/spark-stripe/testing.md

@@ -38,7 +38,7 @@ public function withSubscription($planId = null)
 }
 ```
 
-Once you have define the state method, you may use it when creating models via your factory:
+Once you have defined the state method, you may use it when creating models via your factory:
 
 ```php
 $user = User::factory()->withSubscription('price_id')->create();