fix: update broken link to docs

Author: krauspt

contracts/README.md

@@ -44,7 +44,7 @@ Introducing the development contracts in the order they were created.
 ## Optimized builds
 
 Those development contracts are used for testing in other repos, e.g. in
-[wasmvm](https://github.com/CosmWasm/wasmvm/tree/master/api/testdata) or
+[wasmvm](https://github.com/CosmWasm/wasmvm/tree/main/testdata) or
 [cosmjs](https://github.com/cosmos/cosmjs/tree/main/scripts/wasmd/contracts).
 
 They are [built and deployed](https://github.com/CosmWasm/cosmwasm/releases) by

contracts/reflect/README.md

@@ -64,7 +64,7 @@ be done simply by running `cargo check` or `cargo unit-test`
 Once you have your custom repo, you should check out
 [Developing](./Developing.md) to explain more on how to run tests and develop
 code. Or go through the
-[online tutorial](https://www.cosmwasm.com/docs/getting-started/intro) to get a
+[online tutorial](https://book.cosmwasm.com/index.html) to get a
 better feel of how to develop.
 
 [Publishing](./Publishing.md) contains useful information on how to publish your

contracts/staking/README.md

@@ -28,5 +28,5 @@ transferred to the owners account. (The ownership can also be transferred).
 
 You should check out [Developing](./Developing.md) to explain more on how to run
 tests and develop code. Or go through the
-[online tutorial](https://www.cosmwasm.com/docs/getting-started/intro) to get a
+[online tutorial](https://book.cosmwasm.com/index.html) to get a
 better feel of how to develop.