adjust docs

Author: guillaumemichel

docs/provide-stats.md

@@ -144,15 +144,17 @@ reprovides).
 Number of failed region provide/reprovide operations since startup. Failed
 regions are automatically retried unless the node is offline.
 
-### CIDs provided/min
+### CIDs provided/min/worker
 
-Average rate of initial provides per minute during the last reprovide cycle
-(excludes reprovides).
+Average rate of initial provides per minute per worker during the last
+reprovide cycle (excludes reprovides).
 
-### CIDs reprovided/min
+### CIDs reprovided/min/worker
 
-Average rate of reprovides per minute during the last reprovide cycle (excludes
-initial provides).
+Average rate of reprovides per minute per worker during the last reprovide
+cycle (excludes initial provides). To get an estimation of the total reprovide
+rate, multiply this number by the number of [periodic
+workers](./config.md#providedhtdedicatedperiodicworkers) in use.
 
 ### Region reprovide duration