Fix default collector deployment receiver endpoint

In the default deployment example the export configuration is expecting to use OTLP over HTTP on port 4318. The collector examples though is then showing configuration for receivers on gRPC over 4317, instead of 4318.

content/en/docs/collector/deployment/agent.md

@@ -42,8 +42,8 @@ like so:
 receivers:
   otlp: # the OTLP receiver the app is sending traces to
     protocols:
-      grpc:
-        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
 
 processors:
   batch:
@@ -66,8 +66,8 @@ service:
 receivers:
   otlp: # the OTLP receiver the app is sending metrics to
     protocols:
-      grpc:
-        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
 
 processors:
   batch:
@@ -90,8 +90,8 @@ service:
 receivers:
   otlp: # the OTLP receiver the app is sending logs to
     protocols:
-      grpc:
-        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
 
 processors:
   batch: