Clarify install for sqlcmd (Go)

Author: rwestMSFT

docs/tools/sqlcmd/sqlcmd-download-install.md

@@ -51,6 +51,8 @@ There are two variants of **sqlcmd**:
 
 ### [Windows](#tab/windows)
 
+Choose one of the following options to install **sqlcmd** (Go) on Windows.
+
 #### winget (Windows Package Manager CLI)
 
 1. Install the [Windows Package Manager Client](/windows/package-manager/winget) if you don't already have it.
@@ -77,6 +79,8 @@ There are two variants of **sqlcmd**:
 
 ### [macOS](#tab/mac)
 
+Choose one of the following options to install **sqlcmd** (Go) on macOS.
+
 #### Homebrew
 
 1. Install Homebrew if you need to.
@@ -99,6 +103,8 @@ There are two variants of **sqlcmd**:
 
 ### [Linux](#tab/linux)
 
+Choose one of the following options to install **sqlcmd** (Go) on Linux.
+
 #### apt (Debian/Ubuntu)
 
 1. Import the public repository GPG keys.