updated README.md

Author: joviegas

test/http-client-benchmarks/README.md

@@ -1,4 +1,3 @@
-````markdown
 # HTTP Client Benchmark Harness
 
 This module contains HTTP client benchmark harness using [JMH].
@@ -11,41 +10,52 @@ or measurement time in order to get more reliable data.
 There are three ways to run benchmarks.
 
 - Using the executable JAR (Preferred usage per JMH site)
-```bash
-mvn clean install -P quick -pl :http-client-benchmarks --am
-
+```
+  mvn clean install -P quick -pl :http-client-benchmarks --am
+```
+  
 # Run specific benchmark
-java -jar target/benchmarks.jar Apache5Benchmark
+```
+java -jar target/http-client-benchmarks.jar Apache5Benchmark
+```
 
-# Run all benchmarks: 3 warm up iterations, 3 benchmark iterations, 1 fork
+# Run all benchmarks: 3 warm up iterations, 3 benchmark iterations, 1 fork.
+```
 java -jar target/http-client-benchmarks.jar -wi 3 -i 3 -f 1
 ```
 
 - Using `mvn exec:exec` commands to invoke `UnifiedBenchmarkRunner` main method
-```bash
-mvn clean install -P quick -pl :http-client-benchmarks --am
-mvn clean install -pl :bom-internal
-cd test/http-client-benchmarks
-mvn exec:exec
-```   
+```
+  mvn clean install -P quick -pl :http-client-benchmarks --am
+  mvn clean install -pl :bom-internal
+  cd test/http-client-benchmarks
+  mvn exec:exec
+```
 
 ## UnifiedBenchmarkRunner
 
 The `UnifiedBenchmarkRunner` provides a comprehensive comparison between different HTTP client implementations:
 
 - **Apache4**: Apache HttpClient 4.x baseline
-- **Apache5-Platform**: Apache HttpClient 5.x with platform threads 
+- **Apache5-Platform**: Apache HttpClient 5.x with platform threads
 - **Apache5-Virtual**: Apache HttpClient 5.x with virtual threads
 
-The runner executes all benchmark variations, prints and publishes metrics to CloudWatch.
+The runner executes all benchmark variations, prints metrics to console, and publishes results to CloudWatch metrics for monitoring and analysis.
 
 ## Benchmark Operations
 
 Each benchmark implementation tests the following operations:
 - `simpleGet`: Single-threaded GET operations
-- `simplePut`: Single-threaded PUT operations 
+- `simplePut`: Single-threaded PUT operations
 - `multiThreadedGet`: Multi-threaded GET operations (10 threads)
 - `multiThreadedPut`: Multi-threaded PUT operations (10 threads)
 
-[JMH]: http://openjdk.java.net/projects/code-tools/jmh/
-````
+## Prerequisites
+
+### Java Runtime Requirements
+
+- **Java 8+**: Required for running the benchmarks (as specified by `<javac.target>8</javac.target>`)
+- **Java 21+**: Required for virtual threads support (Apache5-Virtual benchmarks)
+
+**Note**: Virtual threads are a preview feature in Java 19-20 and became stable in Java 21. The Apache5-Virtual benchmarks require Java 21 or later.
+