Documentation update.

Author: mjfryc

src/main/java/pl/mjaron/tinyloki/JsonLogStream.java

@@ -93,8 +93,14 @@ public void clear() {
 
     /**
      * Provide stream data and clear old logs.
+     * <p>
+     * Not thread safe.
+     * <p>
+     * For internal use only.
+     * <p>
+     * Called internally by {@link JsonLogCollector} in thread managed by {@link IExecutor}.
      *
-     * @return JSON-formatted String containing single stream logs from last syncAnd operation or from beginning of time.
+     * @return JSON String containing single stream logs from last syncAnd operation or from beginning of time.
      * Null if this stream is empty.
      */
     public String flush() {

src/main/java/pl/mjaron/tinyloki/TinyLoki.java

@@ -489,12 +489,17 @@ protected void internalProcessLogs() throws InterruptedException {
     }
 
     /**
-     * Requests the executor (worker thread) to stop ASAP. Not synchronized logs are dropped.
+     * Requests the executor (worker thread) to stop ASAP.
+     * <p>
+     * Buffered but not sent logs are dropped.
+     * <p>
+     * <b>Thread safety</b><br/>
+     * It may be called from any thread.
      *
      * @return This reference.
      * @since 1.0.0
      */
-    synchronized public TinyLoki stopAsync() {
+    public TinyLoki stopAsync() {
         executor.stopAsync();
         return this;
     }