Update provider documentation with deprecation dates (MetaMask#163)

* update provider documentation with dates

Co-authored-by: Mark Stacey <[email protected]>

docs/guide/ethereum-provider.md

@@ -1,7 +1,12 @@
 # Ethereum Provider API
 
 ::: tip Recommended Reading
-We recommend that all web3 site developers read the [Upcoming Breaking Changes](#upcoming-breaking-changes) and [Basic Usage](#basic-usage) sections.
+We recommend that all web3 site developers read the [Basic Usage](#basic-usage) section.
+:::
+
+::: warning Upcoming Breaking Changes
+On **November 16, 2020**, we are introducing changes that may break certain web3 sites.
+Please see the [Upcoming Breaking Changes](#upcoming-breaking-changes) section for details.
 :::
 
 MetaMask injects a global API into websites visited by its users at `window.ethereum`.
@@ -33,7 +38,7 @@ if (provider) {
 ## Upcoming Breaking Changes
 
 ::: warning Important Information
-In the near future, we are making changes to our provider API that will be breaking for some web3 sites.
+On **November 16, 2020**, we are making changes to our provider API that will be breaking for some web3 sites.
 These changes are _upcoming_, but you can prepare for them today.
 Follow [this GitHub issue](https://github.com/MetaMask/metamask-extension/issues/8077) for updates.
 
@@ -43,9 +48,6 @@ Other than that, if you are new to using the provider, you do not have to worry
 
 ### `window.ethereum` API Changes
 
-In the near future, we are introducing some breaking changes to this API, which we encourage you to
-[read more about here](https://medium.com/metamask/breaking-changes-to-the-metamask-inpage-provider-b4dde069dd0a).
-
 At that time, we will:
 
 - Ensure that chain IDs returned by `eth_chainId` are **not** 0-padded
@@ -66,6 +68,8 @@ Please read our [Migration Guide](./provider-migration.html) for more details.
 
 ::: tip
 If you do not use the `window.web3` object injected by MetaMask, you will not be affected by these changes.
+
+To understand why we're removing `window.web3`, please see [this GitHub issue](https://github.com/MetaMask/metamask-extension/issues/7163).
 :::
 
 In the near future, we will:

docs/guide/provider-migration.md

@@ -1,6 +1,12 @@
 # Provider Migration Guide
 
-As noted in the [Ethereum Provider documentation](./ethereum-provider.html#upcoming-breaking-changes), we are going to make breaking changes to our provider API and remove our injected `window.web3`.
+::: danger Deadline
+All of these changes are shipping on **November 16, 2020**.
+
+If your web3 site relies on any of these features, it may break when these changes are made unless you migrate.
+:::
+
+As noted in the [Ethereum Provider documentation](./ethereum-provider.html#upcoming-breaking-changes), on **November 16, 2020**, we are shipping breaking changes to our provider API and removing our injected `window.web3`.
 This guide describes how to migrate to the new provider API, and how to replace our `window.web3` object.
 
 All replacement APIs are live, and you can migrate at any time.