Update dev docs with inverted resources/inputs/outputs

With tektoncd#1185 we resolved a lot
of confusion and inconsistency around how we nested things with
input/output, but we didn't update our developer docs :(

In tektoncd#2319 we pointed someone toward these docs and the person ended up
using the old syntax and being confused :(

docs/developers/README.md

@@ -59,8 +59,8 @@ expected in directory path `/workspace/output/resource_name`.
     name: get-gcs-task
     namespace: default
   spec:
-    outputs:
-      resources:
+    resources:
+      outputs:
         - name: gcs-workspace
           type: storage
   ```
@@ -76,8 +76,8 @@ expected in directory path `/workspace/output/resource_name`.
     name: get-gcs-task
     namespace: default
   spec:
-    outputs:
-      resources:
+    resources:
+      outputs:
         - name: gcs-workspace
           type: storage
           targetPath: /workspace/outputstuff
@@ -95,13 +95,12 @@ expected in directory path `/workspace/output/resource_name`.
     name: get-gcs-task
     namespace: default
   spec:
-    inputs:
-      resources:
+    resources:
+      inputs:
         - name: gcs-workspace
           type: storage
           targetPath: random-space
-    outputs:
-      resources:
+      outputs:
         - name: gcs-workspace
           type: storage
   ```
@@ -117,12 +116,11 @@ expected in directory path `/workspace/output/resource_name`.
     name: get-gcs-task
     namespace: default
   spec:
-    inputs:
-      resources:
+    resources:
+      inputs:
         - name: gcs-workspace
           type: storage
-    outputs:
-      resources:
+      outputs:
         - name: gcs-workspace
           type: storage
   ```