Moves note to the beggining of the tutorial page

Signed-off-by: Voldivh <[email protected]>

tutorials/01_install.md

@@ -15,6 +15,8 @@ The source install instructions should be used if you need the very latest
 software improvements, if you need to modify the code, or if you plan to make a
 contribution.
 
+**Note:** If the version is 6 or downwards replace `gz-gui<#>` for `ign-gui<#>` in the command line. For more information take a look [here](https://community.gazebosim.org/t/a-new-era-for-gazebo/1356).
+
 ## Binary Install
 
 ### Ubuntu
@@ -102,7 +104,6 @@ Build and install as follows:
   ```
   Be sure to replace `<#>` with a number value, such as 7 or 8, depending on
   which version you need.
-  **Note:** If the version is 6 or downwards replace `gz-gui<#>` for `ign-gui<#>` in the command line. For more information take a look [here](https://community.gazebosim.org/t/a-new-era-for-gazebo/1356).
 
 2. Install dependencies
   ```