fixing casing

Author: MashaMSFT

articles/azure-sql/database/connect-query-go.md

@@ -38,7 +38,7 @@ To complete this tutorial, you need:
 
 - Golang and related software for your operating system installed:
 
-  - **MacOS**: Install Homebrew and Golang. See [Step 1.2](https://www.microsoft.com/sql-server/developer-get-started/go/mac/).
+  - **macOS**: Install Homebrew and Golang. See [Step 1.2](https://www.microsoft.com/sql-server/developer-get-started/go/mac/).
   - **Ubuntu**:  Install Golang. See [Step 1.2](https://www.microsoft.com/sql-server/developer-get-started/go/ubuntu/).
   - **Windows**: Install Golang. See [Step 1.2](https://www.microsoft.com/sql-server/developer-get-started/go/windows/).
 

articles/azure-sql/database/connect-query-php.md

@@ -38,7 +38,7 @@ To complete this sample, make sure you have the following prerequisites:
 
 - PHP-related software installed for your operating system:
 
-  - **MacOS**, install PHP, the ODBC driver, then install the PHP Driver for SQL Server. See [Step 1, 2, and 3](/sql/connect/php/installation-tutorial-linux-mac).
+  - **macOS**, install PHP, the ODBC driver, then install the PHP Driver for SQL Server. See [Step 1, 2, and 3](/sql/connect/php/installation-tutorial-linux-mac).
 
   - **Linux**, install PHP, the ODBC driver, then install the PHP Driver for SQL Server. See [Step 1, 2, and 3](/sql/connect/php/installation-tutorial-linux-mac).
 

articles/azure-sql/database/connect-query-ruby.md

@@ -38,7 +38,7 @@ To complete this quickstart, you need the following prerequisites:
   
 - Ruby and related software for your operating system:
 
-  - **MacOS**: Install Homebrew, rbenv and ruby-build, Ruby, FreeTDS, and TinyTDS. See Steps 1.2, 1.3, 1.4, 1.5, and 2.1 in [Create Ruby apps using SQL Server on macOS](https://www.microsoft.com/sql-server/developer-get-started/ruby/mac/).
+  - **macOS**: Install Homebrew, rbenv and ruby-build, Ruby, FreeTDS, and TinyTDS. See Steps 1.2, 1.3, 1.4, 1.5, and 2.1 in [Create Ruby apps using SQL Server on macOS](https://www.microsoft.com/sql-server/developer-get-started/ruby/mac/).
 
   - **Ubuntu**: Install prerequisites for Ruby, rbenv and ruby-build, Ruby, FreeTDS, and TinyTDS. See Steps 1.2, 1.3, 1.4, 1.5, and 2.1 in [Create Ruby apps using SQL Server on Ubuntu](https://www.microsoft.com/sql-server/developer-get-started/ruby/ubuntu/).
 

articles/azure-sql/database/machine-learning-services-add-r-packages.md

@@ -24,7 +24,7 @@ This article explains how to add an R package to Azure SQL Database Machine Lear
 
 ## Prerequisites
 
-- Install [R](https://www.r-project.org) and [RStudio Desktop](https://www.rstudio.com/products/rstudio/download/) on your local computer. R is available for Windows, MacOS, and Linux. This article assumes you're using Windows.
+- Install [R](https://www.r-project.org) and [RStudio Desktop](https://www.rstudio.com/products/rstudio/download/) on your local computer. R is available for Windows, macOS, and Linux. This article assumes you're using Windows.
 
 - This article includes an example of using [Azure Data Studio](https://docs.microsoft.com/sql/azure-data-studio/what-is) or [SQL Server Management Studio](https://docs.microsoft.com/sql/ssms/sql-server-management-studio-ssms) (SSMS) to run an R script in Azure SQL Database. You can run R scripts using other database management or query tools, but this example assumes Azure Data Studio or SSMS.