[doc]README now states example files are in the example folder.

README.md

@@ -100,8 +100,8 @@ caisar verify --prover=PROVER FILE
 
 `FILE` defines the property to verify, and it must be
 written in the [WhyML](https://why3.lri.fr/doc-0.80/manual004.html) language.
-Examples of [WhyML](https://why3.lri.fr/doc-0.80/manual004.html) files (`.mlw`)
-can be found in the [tests](https://git.frama-c.com/pub/caisar/-/tree/master/tests)
+Examples of [WhyML](https://why3.lri.fr/doc-0.80/manual004.html) files (`.why`)
+can be found in the [examples](https://git.frama-c.com/pub/caisar/-/tree/master/examples)
 folder.
 
 ### External provers detection