selenium docs: link to section for explicit waits: change identifier from "#explicit-wait" to "#explicit-waits"

Section with identifier #explicit-waits exists.
Section with identifier #explicit-wait does not.

Author: Andrew-Zipperer

chapter_06_explicit_waits_1.asciidoc

@@ -445,7 +445,7 @@ to separate the timing and re-raising logic from the test assertions.
 But we'll wait until we need it in multiple places.
 
 NOTE: If you've used Selenium before, you may know that it has a few
-    https://www.selenium.dev/documentation/webdriver/waits/#explicit-wait[helper functions to do waits].
+    https://www.selenium.dev/documentation/webdriver/waits/#explicit-waits[helper functions to do waits].
     I'm not a big fan of them, though not for any objective reason really.
     Over the course of the book we'll build a couple of wait helper tools
     which I think will make for nice, readable code,