fix: focus 'Running the Plugin' documentation on googleapis, not showcase (#1196)

Author: burkedavison

DEVELOPMENT.md

@@ -183,72 +183,13 @@ $ mvn compile -P update
 
 ## Running the Plugin
 
-1. Clone [googleapis](https://github.com/googleapis/googleapis) and
-   [gapic-showcase](https://github.com/googleapis/gapic-showcase/).
-
-2. Copy the protos from Showcase into googleapis/google/showcase.
-
-    ```sh
-    mkdir googleapis/google/showcase
-    cp -r gapic-showcase/schema/google/showcase/v1beta1 googleapis/google/showcase/v1beta1
-    ```
-
-3. Add the new microgenerator rules to
-   `googleapis/google/showcase/v1beta1/BUILD.bazel` file as follows:
-
-    ```python
-    load(
-        "@com_google_googleapis_imports//:imports.bzl",
-        # Existing rules here.
-        "java_gapic_assembly_gradle_pkg",
-        "java_gapic_library",
-        "java_proto_library",
-        "proto_library_with_info",
-    )
-
-    proto_library_with_info(
-        name = "showcase_proto_with_info",
-        deps = [
-            ":showcase_proto",
-        ],
-    )
-
-    java_proto_library(
-        name = "showcase_java_proto",
-        deps = [
-            ":showcase_proto",
-        ],
-    )
-
-    # This should either replace the existing monolith target or have a unique name
-    # that includes "java_gapic".
-    java_gapic_library(
-        name = "showcase_java_gapic",
-        srcs = [":showcase_proto_with_info"],
-        grpc_service_config = "showcase_grpc_service_config.json",
-        test_deps = [
-            ":showcase_java_grpc",
-        ],
-        deps = [
-            ":showcase_java_proto",
-        ],
-    )
-
-    java_gapic_assembly_gradle_pkg(
-        # This name should be unique from the existing target name.
-        name = "google-cloud-showcase-v1beta1-java",
-        deps = [
-            # This is the new microgen target above.
-            ":showcase_java_gapic",
-            # The following targets already exist.
-            ":showcase_java_grpc",
-            ":showcase_java_proto",
-            ":showcase_proto",
-        ],
-    )
-    ```
-
-4. Point to local gapic-generator-java
+See also above section "Showcase Integration Testing".
+
+To generate a production GAPIC API:
+
+1. Clone [googleapis](https://github.com/googleapis/googleapis).
+
+2. Point to local gapic-generator-java
 
    Normally, googleapis's build pulls in googleapis/gapic-generator-java from the
    Internet:
@@ -265,7 +206,7 @@ $ mvn compile -P update
    )
    ```
 
-   By replacing this portion using the built-in local_repository rule, you can mak
+   By replacing this portion using the built-in local_repository rule, you can make
    it refer to your local development repo:
 
    ```
@@ -275,12 +216,7 @@ $ mvn compile -P update
    )
    ```
 
-5. Build the new target.
-
-   ```sh
-   cd googleapis
-   bazel build //google/showcase/v1beta1:showcase_java_gapic
-   ```
+3. Build the new target.
 
    You can generate any client library based on the protos within googleapis.
    You just need the name of the service within the `java_gapic_assembly_gradle_pkg`