Update a few comments for swift.bzl references.

RELNOTES: None
PiperOrigin-RevId: 469724398
(cherry picked from commit b6f31e7)

swift/swift_common.bzl

@@ -18,9 +18,6 @@ This module is meant to be used by custom rules that need to compile Swift code
 and cannot simply rely on writing a macro that wraps `swift_library`. For
 example, `swift_proto_library` generates Swift source code from `.proto` files
 and then needs to compile them. This module provides that lower-level interface.
-
-Do not load this file directly; instead, load the top-level `swift.bzl` file,
-which exports the `swift_common` module.
 """
 
 load(

swift/toolchains/xcode_swift_toolchain.bzl

@@ -16,7 +16,7 @@
 
 The rules defined in this file are not intended to be used outside of the Swift
 toolchain package. If you are looking for rules to build Swift code using this
-toolchain, see `swift.bzl`.
+toolchain, see `doc/rules.md`.
 """
 
 load("@bazel_features//:features.bzl", "bazel_features")