DOC-1734 Added the upgrade guidelines for 7.4, 8.1, 9.0. (#216)

Author: oleks-k

com.unity.render-pipelines.universal/Documentation~/TableOfContents.md

@@ -7,8 +7,13 @@
   * [Install URP into an existing Project](InstallURPIntoAProject.md)
   * [The Universal Render Pipeline Asset](universalrp-asset.md)
 * [Upgrade guides](upgrade-guides.md)
-  * [Upgrade to URP 7.2.0](upgrade-guide-7-2-0.md)
-  * [Upgrade from LWRP to URP](upgrade-lwrp-to-urp.md)
+  * [Upgrading to URP 9.0.x](upgrade-guide-9-0-x.md)
+  * [Upgrading to URP 8.1.0](upgrade-guide-8-1-0.md)
+  * [Upgrading to URP 8.0.0](upgrade-guide-8-0-0.md)
+  * [Upgrading to URP 7.4.0](upgrade-guide-7-4-0.md)
+  * [Upgrading to URP 7.3.0](upgrade-guide-7-3-0.md)
+  * [Upgrading to URP 7.2.0](upgrade-guide-7-2-0.md)
+  * [Upgrading from LWRP to URP](upgrade-lwrp-to-urp.md)
 * [Rendering](rendering-in-universalrp.md)
 * [Lighting](lighting.md)
   * [Light component reference](light-component)

com.unity.render-pipelines.universal/Documentation~/upgrade-guide-7-4-0.md

@@ -0,0 +1,13 @@
+# Upgrading to version 7.4.0 of the Universal Render Pipeline
+
+This page describes how to upgrade from an older version of the Universal Render Pipeline (URP) to version 7.4.0.
+
+## Upgrading from URP 7.2.x and later
+
+1. URP 7.4.0 does not have breaking changes compared with URP 7.2.x and later. To upgrade URP to version 7.4.0, install the new version of the package.
+
+## Upgrading from URP 7.0.x-7.1.x
+
+1. Upgrade to URP 7.2.0 first. Refer to [Upgrading to version 7.2.0 of the Universal Render Pipeline](upgrade-guide-7-2-0).
+
+2. Perform the procedure **Upgrading from URP 7.2.x**.

com.unity.render-pipelines.universal/Documentation~/upgrade-guide-8-0-0.md

@@ -4,10 +4,10 @@ This page describes how to upgrade from an older version of the Universal Render
 
 ## Upgrading from URP 7.2.x and later
 
-1. URP 8.0.0 does not support the package Post-processing v2. If your Project uses the package Post-processing v2, upgrade the effects that use this package first.
+1. URP 8.x.x does not support the package Post-Processing Stack v2. If your Project uses the package Post-Processing Stack v2, migrate the effects that use this package first.
 
 ## Upgrading from URP 7.0.x-7.1.x
 
 1. Upgrade to URP 7.2.0 first. Refer to [Upgrading to version 7.2.0 of the Universal Render Pipeline](upgrade-guide-7-2-0).
 
-2. URP 8.0.0 does not support the package Post-processing v2. If your Project uses the package Post-processing v2, upgrade the effects that use this package first.
+2. URP 8.x.x does not support the package Post-Processing Stack v2. If your Project uses the package Post-Processing Stack v2, migrate the effects that use this package first.

com.unity.render-pipelines.universal/Documentation~/upgrade-guide-8-1-0.md

@@ -0,0 +1,17 @@
+# Upgrading to version 8.1.x of the Universal Render Pipeline
+
+This page describes how to upgrade from an older version of the Universal Render Pipeline (URP) to version 8.1.x.
+
+## Upgrading from URP 8.0.x
+
+1. URP 8.1.x does not have breaking changes compared with URP 8.0.x. To upgrade URP to version 8.1.x, install the new version of the package.
+
+## Upgrading from URP 7.2.x and later 7.x releases
+
+1. URP 8.x.x does not support the package Post-Processing Stack v2. If your Project uses the package Post-Processing Stack v2, migrate the effects that use this package first.
+
+## Upgrading from URP 7.0.x-7.1.x
+
+1. Upgrade to URP 7.2.0 first. Refer to [Upgrading to version 7.2.0 of the Universal Render Pipeline](upgrade-guide-7-2-0).
+
+2. URP 8.x.x does not support the package Post-Processing Stack v2. If your Project uses the package Post-Processing Stack v2, migrate the effects that use this package first.

com.unity.render-pipelines.universal/Documentation~/upgrade-guide-9-0-x.md

@@ -0,0 +1,17 @@
+# Upgrading to version 9.0.x of the Universal Render Pipeline
+
+This page describes how to upgrade from an older version of the Universal Render Pipeline (URP) to version 9.0.x.
+
+## Upgrading from URP 8.0.x and later 8.x releases
+
+1. URP 9.0.x does not have breaking changes compared with URP 8.x.x. To upgrade URP to version 9.0.x, install the new version of the package.
+
+## Upgrading from URP 7.2.x and later 7.x releases
+
+1. URP 9.x.x does not support the package Post-Processing Stack v2. If your Project uses the package Post-Processing Stack v2, migrate the effects that use that package first.
+
+## Upgrading from URP 7.0.x-7.1.x
+
+1. Upgrade to URP 7.2.0 first. Refer to [Upgrading to version 7.2.0 of the Universal Render Pipeline](upgrade-guide-7-2-0).
+
+2. URP 8.x.x does not support the package Post-Processing Stack v2. If your Project uses the package Post-Processing Stack v2, migrate the effects that use that package first.

com.unity.render-pipelines.universal/Documentation~/upgrade-guides.md

@@ -2,7 +2,10 @@
 
 This section contains information about upgrading from an older version of the Universal Render Pipeline (URP) to a more recent version, and about upgrading from the Lightweight Render Pipeline (LWRP) to URP.
 
+* [Upgrading to URP 9.0.x](upgrade-guide-9-0-x.md)
+* [Upgrading to URP 8.1.0](upgrade-guide-8-1-0.md)
 * [Upgrading to URP 8.0.0](upgrade-guide-8-0-0.md)
+* [Upgrading to URP 7.4.0](upgrade-guide-7-4-0.md)
 * [Upgrading to URP 7.3.0](upgrade-guide-7-3-0.md)
 * [Upgrading to URP 7.2.0](upgrade-guide-7-2-0.md)
 * [Upgrading from LWRP to URP](upgrade-lwrp-to-urp.md)