Update instrumentation/jmx-metrics/library/src/main/resources/jmx/rules/jvm.yaml

Co-authored-by: SylvainJuge <[email protected]>

Author: schmikei

instrumentation/jmx-metrics/library/src/main/resources/jmx/rules/jvm.yaml

@@ -100,7 +100,7 @@ rules:
       OpenFileDescriptorCount:
         metric: file_descriptor.count
         type: updowncounter
-        unit: "{file_descriptors}"
+        unit: "{file_descriptor}"
         desc: Number of open file descriptors.
 
   - bean: java.nio:name=*,type=BufferPool