doc: release notes: added tag

Signed-off-by: Yves Vandervennet <[email protected]>

Author: yvanderv

doc/releases/release-notes-nxp-zsdk-v3.7.0.txt

@@ -9,7 +9,7 @@ How to get the code
 Use the getting Zephyr started guide to setup your development environment. However,
 the west init command is as follows:
 
- $ west init -m https://github.com/nxp-zephyr/nxp-zsdk.git --mr <<TODO: INSERT version/tag/branch>>
+ $ west init -m https://github.com/nxp-zephyr/nxp-zsdk.git --mr nxp-v3.7.0
 
 Then, run:
  $ west update