Fix typo in high-definition

ScriptableRenderPipeline/HDRenderPipeline/package.json

 {
-    "name": "com.unity.render-pipelines.high-defintion",
+    "name": "com.unity.render-pipelines.high-definition",
     "description": "HD Render Pipeline for Unity.",
     "version": "0.1.13",
     "unity": "2018.1",

ScriptableRenderPipeline/HDRenderPipeline/sub-package.json

 {
-	"name": "com.unity.render-pipelines.high-defintion",
+	"name": "com.unity.render-pipelines.high-definition",
 	"description": "HD Render Pipeline for Unity.",
     "subDependencies": [
         "com.unity.render-pipelines.core"