Change "client" to "SDK"

As we mostly refer to our "SDKs" rather than our "clients",
we've updated our docs to prefer "SDK". This PR makes equivalent
updates to the Java SDK README.

Addresses: https://app.asana.com/0/1206419570114940/1207978475519546/f

Author: jseldess

README.md

@@ -1,6 +1,6 @@
-# Pinecone Java Client
+# Pinecone Java SDK
 
-The Pinecone Java client lets JVM applications interact with Pinecone services.
+The Pinecone Java SDK lets JVM applications interact with Pinecone services.
 
 ## Requirements
 
@@ -28,8 +28,8 @@ implementation "io.pinecone:pinecone-client:1.2.2"
 
 [comment]: <> (^ [pc:VERSION_LATEST_RELEASE])
 
-Alternatively, you can use our standalone uberjar [pinecone-client-2.0.0-all.jar](https://repo1.maven.org/maven2/io/pinecone/pinecone-client/2.0.0/pinecone-client-2.0.0-all.jar), which bundles the pinecone
-client and all dependencies together. You can include this in your classpath like you do with any 3rd party JAR without
+Alternatively, you can use our standalone uberjar [pinecone-client-2.0.0-all.jar](https://repo1.maven.org/maven2/io/pinecone/pinecone-client/2.0.0/pinecone-client-2.0.0-all.jar), which bundles the Pinecone
+SDK and all dependencies together. You can include this in your classpath like you do with any 3rd party JAR without
 having to obtain the *pinecone-client* dependencies separately.
 
 [comment]: <> (^ [pc:VERSION_LATEST_RELEASE])