Update java docs for v5 release (#607)

Author: typotter

docs/sdks/server-sdks/java/bandits.mdx

@@ -21,8 +21,7 @@ In order for the bandit to learn an optimized policy, we need to capture and log
 This requires defining a bandit logger in addition to an assignment logger.
 
 ```java
-EppoClient.Builder()
-  .apiKey(apiKey)
+EppoClient.builder(sdkKey)
   .assignmentLogger(assignmentLogData -> {
     System.out.println("TODO: send assignment event data to data warehouse: " + assignmentLogData);
   })

docs/sdks/server-sdks/java/initialization.mdx

@@ -12,13 +12,12 @@ The Eppo Java SDK is easy to initialize while offering robust customization opti
 To complete basic initialization, you only need to provide an SDK key. [Create an SDK key](/sdks/sdk-keys) if you don't already have one.
 
 ```java
-EppoClient.Builder()
-  .apiKey(apiKey)
+EppoClient.builder(sdkKey)
   .buildAndInit();
 ```
 
 <ApiOptionRef
-    name="apiKey"
+    name="sdkKey"
     type="string"
 >
     Your SDK key. [Create an SDK key](/sdks/sdk-keys) if you don't already have one.
@@ -94,8 +93,7 @@ Basic initialization is great for most use cases, but the SDK provides options t
 Here's an example of using multiple configuration options:
 
 ```java
-EppoClient.Builder()
-  .apiKey(apiKey)
+EppoClient.builder(sdkKey)
   .gracefulMode(true)
   .pollingIntervalMs(60000) // Poll every minute
   .assignmentLogger(assignmentLogData -> {
@@ -118,5 +116,5 @@ The SDK provides several utility methods that can be useful:
 eppoClient.setIsGracefulFailureMode(false);
 
 // Stop polling for configuration updates
-EppoClient.stopPolling();
+eppoClient.stopPolling();
 ``` 

docs/sdks/server-sdks/java/quickstart.mdx

@@ -16,7 +16,7 @@ You can install the SDK using Gradle or Maven:
 <TabItem value="gradle" label="Gradle">
 
 ```groovy
-implementation 'cloud.eppo:eppo-server-sdk:3.5.3'
+implementation 'cloud.eppo:eppo-server-sdk:5.0.0'
 ```
 
 </TabItem>
@@ -26,7 +26,7 @@ implementation 'cloud.eppo:eppo-server-sdk:3.5.3'
 <dependency>
   <groupId>cloud.eppo</groupId>
   <artifactId>eppo-server-sdk</artifactId>
-  <version>3.0.1</version>
+  <version>5.0.0</version>
 </dependency>
 ```
 
@@ -42,9 +42,7 @@ implementation 'cloud.eppo:eppo-server-sdk:3.5.3'
 Initialize the SDK with your key:
 
 ```java
-EppoClient eppoClient = EppoClient.Builder()
-  .apiKey(sdkKey)
-  .buildAndInit();
+EppoClient eppoClient = EppoClient.builder(sdkKey).buildAndInit();
 ```
 
 ### Assign a variant
@@ -91,8 +89,7 @@ The SDK provides different assignment functions based on the type of value you n
 For experiments, you'll need to add an assignment logger (see [`AssignmentLogger`](/sdks/server-sdks/java/assignments#assignment-logger)) when initializing the SDK:
 
 ```java
-EppoClient.Builder()
-  .apiKey(apiKey)
+EppoClient.builder(sdkKey)
   .assignmentLogger(assignmentLogData -> {
     // TODO: Send assignment event data to data warehouse
     System.out.println(assignmentLogData);
@@ -107,8 +104,7 @@ After that, you can make assignments the same way as with feature flags.
 For bandits, you'll need both an [`assignment logger`](/sdks/server-sdks/java/assignments#assignment-logger) and a [`bandit logger`](/sdks/server-sdks/java/bandits#define-a-bandit-assignment-logger):
 
 ```java
-EppoClient.Builder()
-  .apiKey(apiKey)
+EppoClient.builder(sdkKey)
   .assignmentLogger(assignmentLogData -> {
     // TODO: Send assignment event data to data warehouse
     System.out.println(assignmentLogData);