doc/go1.19: Linux race detector now requires glibc 2.17

Fixes golang#53522

Change-Id: Ibed838d358a733d26a6c3d89446d7fadb1012961
Reviewed-on: https://go-review.googlesource.com/c/go/+/413876
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: ianlancetaylor

doc/go1.19.html

@@ -807,6 +807,7 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
       Compared to v2, it is now typically 1.5x to 2x faster, uses half
       as much memory, and it supports an unlimited number of
       goroutines.
+      On Linux, the race detector now requires at least glibc version 2.17.
     </p>
 
     <p><!-- CL 336549 -->