Add note about stability and tweak index docs

provider/internal/image.go

@@ -72,16 +72,10 @@ func (i *Image) Annotate(a infer.Annotator) {
 
 		## Stability
 
-		**This resource is experimental and subject to change.**
+		**This resource is pre-1.0 and in public preview.**
 
-		API types are unstable. Subsequent releases _may_ require manual edits
-		to your state file(s) in order to adopt API changes.
-
-		"retainOnDelete: true" is recommended with this resource until it is
-		stable. This enables future API changes to be adopted more easily by renaming
-		resources.
-
-		Only use this resource if you understand and accept the risks.
+		We will strive to keep APIs and behavior as stable as possible, but we
+		cannot guarantee stability until version 1.0.
 	`)+
 		"\n\n"+_migration+
 		"\n\n"+_imageExamples,