docs(engx): clean up dev docs, add convenience commands (#820)

DEVELOPMENT.md

@@ -97,13 +97,6 @@
     bazel run //src/test/java/com/google/api/generator/engine:JavaCodeGeneratorTest
     ```
 
--   Update goldens files based on code generation in unit test, for example
-    `JavaCodeGeneratorTest.java`
-
-    ```sh
-    bazel run //src/test/java/com/google/api/generator/engine:JavaCodeGeneratorTest_update
-    ```
-
 -   Run a single integration test for API like `Redis`, it generates Java source
     code using the Java microgenerator and compares them with the goldens files
     in `test/integration/goldens/redis`.
@@ -112,10 +105,20 @@
     bazel test //test/integration:redis
     ```
 
--   Update goldens files based on code generation in integration test, for
-    example `Redis`. It generates Java source code using the Java microgenerator
-    and overwrites the goldens files in `test/integration/goldens/redis` based
-    on code generation.
+-   Run all unit and integration tests.
+
+    ```sh
+    bazel test $(bazel query "src/test/..." | grep "Test$") //test/integration/...
+    ```
+
+-   Update unit test golden files, for example `JavaCodeGeneratorTest.java`:
+
+    ```sh
+    bazel run //src/test/java/com/google/api/generator/engine:JavaCodeGeneratorTest_update
+    ```
+
+-   Update integration test golden files, for example `Redis`. This clobbers all the
+    files in `test/integration/goldens/redis`.
 
     ```sh
     bazel run //test/integration:redis_update