docs: Adds AMD best practice layer env variable description

docs/best_practices.md

@@ -54,6 +54,42 @@ VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT;VALIDATION_CHEC
 VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT:VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_ARM
 ```
 
+Similarly to enable the AMD-specific best pratices checks, use the following:
+
+```code
+khronos_validation.enables = VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT,VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_AMD
+```
+
+ - or the environment variables for Windows
+
+```code
+VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT;VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_AMD
+```
+
+ - or for Linux -
+
+```code
+VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT:VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_AMD
+```
+
+To enable all vendor-specific checks, use:
+
+```code
+khronos_validation.enables = VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT,VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_ALL
+```
+
+ - or the environment variables for Windows
+
+```code
+VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT;VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_ALL
+```
+
+ - or for Linux -
+
+```code
+VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_BEST_PRACTICES_EXT:VALIDATION_CHECK_ENABLE_VENDOR_SPECIFIC_ALL
+```
+
 Some platforms do not support configuration of the validation layers with this configuration file.
 Programs running on these platforms must then use the programmatic interface.