Clarify current thread id javadoc

Author: kaahos

ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java

@@ -334,8 +334,7 @@ public long getCurrentTicks() {
     }
 
     /**
-     * Returns the OS-level thread ID (tid) of the calling thread, cached in ProfiledThread TLS.
-     * Safe to call from any profiled thread; returns -1 if ProfiledThread is not initialized.
+     * Returns the OS-level thread ID (tid) of the calling thread.
      */
     public int getCurrentThreadId() {
         return getTid0();