Add header above release table

Add section header directly above the table of available builds and installers. This makes it easy to create link to the table when sharing with someone.

README.md

@@ -63,8 +63,7 @@ Visibility|All legs|
 |Public|[![Status](https://dev.azure.com/dnceng/public/_apis/build/status/176)](https://dev.azure.com/dnceng/public/_build?definitionId=176)|
 |Microsoft Internal|[![Status](https://dev.azure.com/dnceng/internal/_apis/build/status/286)](https://dev.azure.com/dnceng/internal/_build?definitionId=286)|
 
-Installers and Binaries
+## Installers and Binaries
------------------------
 
 You can download the .NET Core SDK as either an installer (MSI, PKG) or a zip (zip, tar.gz). The .NET Core SDK contains both the .NET Core runtime and CLI tools.
 
@@ -128,6 +127,8 @@ We strongly recommend using `--skip-manifest-update` with `dotnet workload insta
 
 Please do not directly edit the table below. Use https://github.com/dotnet/installer/tree/main/tools/sdk-readme-table-generator to help you generate it. Make sure to run the table generator test and make any changes to the generator along with your changes to the table.
 
+### Table
+
 | Platform | main<br>(7.0.x&nbsp;Runtime) | Release/7.0.1xx-preview1<br>(7.0.x&nbsp;Runtime) | Release/6.0.2XX<br>(6.0.x&nbsp;Runtime) | Release/6.0.1XX<br>(6.0.x&nbsp;Runtime) | Release/5.0.4XX<br>(5.0 Runtime) | Release/5.0.2XX<br>(5.0 Runtime) | Release/3.1.4XX<br>(3.1.x Runtime) |
 | :--------- | :----------: | :----------: | :----------: | :----------: | :----------: | :----------: | :----------: |
 | **Windows x64** | [![][win-x64-badge-main]][win-x64-version-main]<br>[Installer][win-x64-installer-main] - [Checksum][win-x64-installer-checksum-main]<br>[zip][win-x64-zip-main] - [Checksum][win-x64-zip-checksum-main] | [![][win-x64-badge-7.0.1XX-preview1]][win-x64-version-7.0.1XX-preview1]<br>[Installer][win-x64-installer-7.0.1XX-preview1] - [Checksum][win-x64-installer-checksum-7.0.1XX-preview1]<br>[zip][win-x64-zip-7.0.1XX-preview1] - [Checksum][win-x64-zip-checksum-7.0.1XX-preview1] | [![][win-x64-badge-6.0.2XX]][win-x64-version-6.0.2XX]<br>[Installer][win-x64-installer-6.0.2XX] - [Checksum][win-x64-installer-checksum-6.0.2XX]<br>[zip][win-x64-zip-6.0.2XX] - [Checksum][win-x64-zip-checksum-6.0.2XX] | [![][win-x64-badge-6.0.1XX]][win-x64-version-6.0.1XX]<br>[Installer][win-x64-installer-6.0.1XX] - [Checksum][win-x64-installer-checksum-6.0.1XX]<br>[zip][win-x64-zip-6.0.1XX] - [Checksum][win-x64-zip-checksum-6.0.1XX] | [![][win-x64-badge-5.0.4XX]][win-x64-version-5.0.4XX]<br>[Installer][win-x64-installer-5.0.4XX] - [Checksum][win-x64-installer-checksum-5.0.4XX]<br>[zip][win-x64-zip-5.0.4XX] - [Checksum][win-x64-zip-checksum-5.0.4XX] | [![][win-x64-badge-5.0.2XX]][win-x64-version-5.0.2XX]<br>[Installer][win-x64-installer-5.0.2XX] - [Checksum][win-x64-installer-checksum-5.0.2XX]<br>[zip][win-x64-zip-5.0.2XX] - [Checksum][win-x64-zip-checksum-5.0.2XX] | [![][win-x64-badge-3.1.4XX]][win-x64-version-3.1.4XX]<br>[Installer][win-x64-installer-3.1.4XX] - [Checksum][win-x64-installer-checksum-3.1.4XX]<br>[zip][win-x64-zip-3.1.4XX] - [Checksum][win-x64-zip-checksum-3.1.4XX] |