Update usage_guide.md

Author: pensivebrian

doc/usage_guide.md

@@ -1,13 +1,9 @@
 # Usage Guide
-Contents:
-
-[Description](#Description)
-
-[Options](#options)
-
-[Examples](#examples)
-
-[Environment Variables](#environment-variables)
+Contents
+* [Description](#description)
+* [Options](#options)
+* [Examples](#examples)
+*  [Environment Variables](#environment-variables)
 
 ## Description
 mssql-cli is a new and interactive command line query tool for SQL Server. This open source tool works cross-platform and is a proud member of the dbcli community.
@@ -29,7 +25,7 @@ Usage: main.py [OPTIONS]
 
 Options:
     -S, --server TEXT       SQL Server instance name or address.
-    -U, --username TEXT     Username to connect to the postgres database.
+    -U, --username TEXT     Username to connect to the database.
     -W, --password          Force password prompt.
     -E, --integrated        Use integrated authentication on windows.
     -v, --version           Version of mssql-cli.
@@ -46,52 +42,42 @@ Options:
 ## Examples
 Below are example commands that run against the AdventureWorks database in a localhost server instance. Here is a list of examples:
 
-[Connect to a server](#Connect-to-a-server)
-
-[Exit mssql-cli](#Exit-mssql-cli)
-
-[Navigate multiple pages of query result](#Navigate-multiple-pages-of-query-result)
-
-[Quit a query](#Quit-a-query)
-
-[Clear screen](#Clear-screen)
-
-[Toggle multi-line mode](#Toggle-multi-line-mode)
-
-
-
-### <a id="Connect-to-a-server"></a>Connect to a server
+ * [Connect to a server](#connect-to-a-server)
+ * [Exit mssql-cli](#exit-mssql-cli)
+ * [Navigate multiple pages of query result](#navigate-multiple-pages-of-query-result)
+ * [Quit a query](#quit-a-query)
+ * [Clear screen](#clear-screen)
+ * [Toggle multi-line mode](#toggle-multi-line-mode)
 
+### Connect to a server
 Connect to a server, a specific database, and with a username. -S -d and -U are optional. You can [set environment variables](#Environment-Variables) to set default settings.
 
 ```bash
 mssql-cli -S localhost -d AdventureWorks -U sa
 ```
 
-### <a id="Exit-mssql-cli"></a> Exit mssql-cli 
-
+### Exit mssql-cli 
 Press **Ctrl+D** or type:
-
 ```bash
 quit
 ```
 
-### <a id="Navigate-multiple-pages-of-query-result"></a>Navigate multiple pages of query result
+### Navigate multiple pages of query result
 If you select a table that has many rows, it may display the results in multiple pages.
 
 - Press **Enter** key to see one row at a time.
 - Press **Space bar** to see one page at a time.
 - Press **q** to escape from the result view.
 
-### <a id="Quit-a-query"></a>Quit a query
+### Quit a query
 If you are in the middle of writing a query and would like to cancel it, press **Ctrl+C**
 
-### <a id="Clear-screen"></a>Clear screen
+### Clear screen
 If you want to clear the Terminal view, press **Ctrl+K**
 
 If you want to clear in Command Prompt, press **Ctrl+L**
 
-### <a id="Toggle-multi-line-mode"></a>Toggle multi-line mode
+### Toggle multi-line mode
 To enable multi-line mode, press **F3 key**. You can see at bottom of screen if Multiline is on or off.
 
 To use multi-line mode, follow these instruction:
@@ -125,55 +111,50 @@ SELECT "Name", "DepartmentID"
 
 ## Environment Variables
 Below are a list of environment variables that can be set.
+* MSSQL_CLI_SERVER - [Set default server](#set-default-server)
+* MSSQL_CLI_DATABASE - [Set default database](#set-default-database)
+* MSSQL_CLI_USER - [Set default user](#set-default-user)
+* MSSQL_CLI_PASSWORD - [Set default password](#set-default-password)
+* MSSQL_CLI_ROW_LIMIT - [Set default row limit](#set-default-row-limit)
 
 **Important: If you are using macOS or Linux, use 'export' instead of 'set'. 'set' is Windows-only.**
 
-[Set default server](#Set-default-server)
-
-[Set default user](#Set-default-user)
-
-[Set default password](#Set-default-password)
-
-[Set default database](#Set-default-database)
-
-[Set default row limit](#Set-default-row-limit)
-
-### <a id="Set-default-server"></a>Set default server
+### Set default server
 Set environment variable MSSQL_CLI_SERVER to set a default SQL Server instance name or address
 
 ```bash
 set MSSQL_CLI_SERVER=localhost
 mssql-cli
 ```
 
-###<a id="Set-default-user"></a> Set default user
+### Set default database
+Set environment variable MSSQL_CLI_DATABASE to set a default database.
+
+```bash
+set MSSQL_CLI_DATABASE=AdventureWorks
+mssql-cli -S localhost -U sa
+```
+
+### Set default user
 Set environment variable MSSQL_CLI_USER to set a default user.
 
 ```bash
 set MSSQL_CLI_USER=sa
 mssql-cli -S localhost -d AdventureWorks
 ```
 
-###<a id="Set-default-password"></a> Set default password
+### Set default password
 Set environment variable MSSQL_CLI_PASSWORD to set a default password.
 
 ```bash
 set MSSQL_CLI_PASSWORD=abc123
 mssql-cli -S localhost -d AdventureWorks -U sa
 ```
 
-###<a id="Set-default-database"></a> Set default database
-Set environment variable MSSQL_CLI_DATABASE to set a default database.
-
-```bash
-set MSSQL_CLI_DATABASE=AdventureWorks
-mssql-cli -S localhost -U sa
-```
-
-###<a id="Set-default-row-limit"></a> Set default row limit
+### Set default row limit
 Set environment variable MSSQL_CLI_ROW_LIMIT to set threshold for row limit prompt. Use 0 to disable prompt.
 
 ```bash
 set MSSQL_CLI_ROW_LIMIT=10
 mssql-cli -S localhost -U sa
-```
+```