[PATCH] ref-manual: Add Az fetcher documentation

["Alejandro Hernandez Samaniego" <alhe@linux.microsoft.com>]

Signed-off-by: Alejandro Enedino Hernandez Samaniego <alhe@linux.microsoft.com>
---
 documentation/ref-manual/variables.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 2cb37b6a2..7539dec9d 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -270,6 +270,18 @@ system and gives an overview of their function and contents.
       ":ref:`Basic Syntax <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:basic syntax>`" section in the BitBake
       User Manual for more information.
 
+   :term:`AZ_SAS`
+      Azure Storage Shared Access Signature, when using the
+      :ref:`Azure Storage fetcher (az://) <bitbake:bitbake-user-manual/bitbake-user-manual-fetching:fetchers>`
+      This variable can be defined to be used by the fetcher to authenticate
+      and gain access to non-public artifacts.
+      ::
+
+         AZ_SAS = ""se=2021-01-01&sp=r&sv=2018-11-09&sr=c&skoid=<skoid>&sig=<signature>""
+
+      For more information see Microsoft's Azure Storage documentation at
+      https://docs.microsoft.com/en-us/azure/storage/common/storage-sas-overview
+
    :term:`B`
       The directory within the :term:`Build Directory` in
       which the OpenEmbedded build system places generated objects during a
@@ -7103,6 +7115,8 @@ system and gives an overview of their function and contents.
 
       -  ``npm://`` - Fetches JavaScript modules from a registry.
 
+      -  ``az://`` - Fetches files from an Azure Storage account.
+
       Standard and recipe-specific options for ``SRC_URI`` exist. Here are
       standard options:
 
-- 
2.25.1