docs: update timers config description

Fixes jestjs#11370

docs/Configuration.md

@@ -1296,7 +1296,7 @@ This option sets the URL for the jsdom environment. It is reflected in propertie
 
 Default: `real`
 
-Setting this value to `fake` or `modern` allows the use of fake timers for functions such as `setTimeout`. Fake timers are useful when a piece of code sets a long timeout that we don't want to wait for in a test.
+Setting this value to `fake` or `modern` enables fake timers for all tests by default. Fake timers are useful when a piece of code sets a long timeout that we don't want to wait for in a test. You can learn more about fake timers [here](https://jestjs.io/docs/jest-object#jestusefaketimersimplementation-modern--legacy).
 
 If the value is `legacy`, the old implementation will be used as implementation instead of one backed by [`@sinonjs/fake-timers`](https://github.com/sinonjs/fake-timers).
 

website/versioned_docs/version-25.x/Configuration.md

@@ -1181,7 +1181,7 @@ This option sets the URL for the jsdom environment. It is reflected in propertie
 
 Default: `real`
 
-Setting this value to `legacy` or `fake` allows the use of fake timers for functions such as `setTimeout`. Fake timers are useful when a piece of code sets a long timeout that we don't want to wait for in a test.
+Setting this value to `legacy` or `fake` enables fake timers for all tests by default. Fake timers are useful when a piece of code sets a long timeout that we don't want to wait for in a test. You can learn more about fake timers [here](https://jestjs.io/docs/25.x/jest-object#jestusefaketimers).
 
 ### `transform` \[object\<string, pathToTransformer | \[pathToTransformer, object]>]
 

website/versioned_docs/version-26.x/Configuration.md

@@ -1271,7 +1271,8 @@ This option sets the URL for the jsdom environment. It is reflected in propertie
 
 Default: `real`
 
-Setting this value to `legacy` or `fake` allows the use of fake timers for functions such as `setTimeout`. Fake timers are useful when a piece of code sets a long timeout that we don't want to wait for in a test.
+Setting this value to `legacy` or `modern` enables fake timers for all tests by default. Fake timers are useful when a piece of code sets a long timeout that we don't want to wait for in a test. You can learn more about fake timers [here](https://jestjs.io/docs/26.x/jest-object#jestusefaketimersimplementation-modern--legacy).
+
 
 If the value is `modern`, [`@sinonjs/fake-timers`](https://github.com/sinonjs/fake-timers) will be used as implementation instead of Jest's own legacy implementation. This will be the default fake implementation in Jest 27.