Update README.md

Author: Bilogweb3

rayon-core/src/sleep/README.md

@@ -139,7 +139,7 @@ The full protocol for a thread to fall asleep is as follows:
   * Checks the JEC to see that it has not changed from `final_value`.
     * If it has, then the thread goes back to searching for work. We reset to
       just before we got sleepy, so that we will do one more search
-      before attending to sleep again (rather than searching for many rounds).
+      before attempting to sleep again (rather than searching for many rounds).
   * Increments the number of sleeping threads by 1.
 * The thread then executes a seq-cst fence operation (see below).
 * The thread then does one final check for injected jobs (see below). If any
@@ -216,4 +216,4 @@ Meanwhile, the sleepy thread does the following:
 Either PushFence or SleepFence must come first:
 
 * If PushFence comes first, then PushJob must be visible to ReadJob.
-* If SleepFence comes first, then IncSleepers is visible to ReadSleepers.
+* If SleepFence comes first, then IncSleepers is visible to ReadSleepers.