docs: update README about and correct distribution name in repo metadata (#16)

Author: anguillanneuf

.readme-partials.yaml

@@ -97,3 +97,14 @@ custom_content: |
     ```java
     spark.readStream.format("pubsublite").option("gcp.credentials.key", "<SERVICE_ACCOUNT_JSON_IN_BASE64>")
     ```
+about: |
+  [Google Cloud Pub/Sub Lite][product-docs] is a zonal, real-time messaging
+  service that lets you send and receive messages between independent
+  applications. You can manually configure the throughput and storage capacity
+  for Pub/Sub Lite systems.
+
+  The Pub/Sub Lite Spark connector supports Pub/Sub Lite as an input source to
+  Apache Spark Structured Streaming in both the default micro-batch processing
+  mode and the _experimental_ continous processing mode. The connector works in
+  all Apache Spark distributions, including [Google Cloud Dataproc](https://cloud.google.com/dataproc/docs/)
+  and manual Spark installations.

.repo-metadata.json

@@ -2,7 +2,7 @@
   "name": "pubsublite-spark",
   "name_pretty": "Pub/Sub Lite Spark Connector",
   "product_documentation": "https://cloud.google.com/pubsub/lite/docs",
-  "api_description": "is designed to provide reliable,\nmany-to-many, asynchronous messaging between applications. Publisher\napplications can send messages to a topic and other applications can\nsubscribe to that topic to receive the messages. By decoupling senders and\nreceivers, Google Cloud Pub/Sub allows developers to communicate between\nindependently written applications.\n\nCompared to Google Pub/Sub, Pub/Sub Lite provides partitioned zonal data\nstorage with predefined capacity. Both products present a similar API, but\nPub/Sub Lite has more usage caveats.\n\nSee the [Google Pub/Sub Lite docs](https://cloud.google.com/pubsub/quickstart-console#before-you-begin) for more details on how to activate\nPub/Sub Lite for your project, as well as guidance on how to choose between\nCloud Pub/Sub and Pub/Sub Lite.",
+  "api_description": "Pub/Sub Lite is a zonal, real-time messaging service that lets you send and receive messages between independent applications. You can manually configure the throughput and storage capacity for Pub/Sub Lite systems.",
   "client_documentation": "https://googleapis.dev/java/google-cloud-pubsublite/latest/index.html",
   "release_level": "alpha",
   "transport": "grpc",
@@ -11,7 +11,7 @@
   "min_java_version": 8,
   "repo": "googleapis/java-pubsublite-spark",
   "repo_short": "java-pubsublite-spark",
-  "distribution_name": "com.google.cloud:pubsublite-spark",
+  "distribution_name": "com.google.cloud:pubsublite-spark-sql-streaming",
   "codeowner_team": "@googleapis/api-pubsub",
   "api_id": "pubsublite.googleapis.com"
 }