Revise ExecuTorch documentation for Apple runtime (pytorch#15293)

Author: shoumikhin

docs/source/_static/img/swiftpm_xcode1.png

@@ -18,15 +18,17 @@ The ExecuTorch Runtime for iOS and macOS (ARM64) is distributed as a collection
 
 Link your binary with the ExecuTorch runtime and any backends or kernels used by the exported ML model. It is recommended to link the core runtime to the components that use ExecuTorch directly, and link kernels and backends against the main app target.
 
-**Note:** To access logs, link against the Debug build of the ExecuTorch runtime, i.e., the `executorch_debug` framework. For optimal performance, always link against the Release version of the deliverables (those without the `_debug` suffix), which have all logging overhead removed.
+**Note:** You may need to add some extra linker flags for the build settings of the components that links against ExecuTorch backends or kernels to let them register properly at the app startup. See the [Linkage](#Linkage) section for more details.
+
+**Note:** To access logs, link against the Debug build of the ExecuTorch runtime, i.e., the `executorch_debug` framework. For optimal performance, always link against the Release version of the deliverables (those without the `_debug` suffix), which have all logging overhead removed. See the [Logging](#Logging) section for more details.
 
 ### Swift Package Manager
 
 The prebuilt ExecuTorch runtime, backend, and kernels are available as a [Swift PM](https://www.swift.org/documentation/package-manager/) package.
 
 #### Xcode
 
-In Xcode, go to `File > Add Package Dependencies`. Paste the URL of the [ExecuTorch repo](https://github.com/pytorch/executorch) into the search bar and select it. Make sure to change the branch name to the desired ExecuTorch version in format "swiftpm-<version>", (e.g. "swiftpm-0.7.0"), or a branch name in format "swiftpm-<version>.<year_month_date>" (e.g. "swiftpm-0.8.0-20250801") for a [nightly build](https://ossci-ios.s3.amazonaws.com/list.html) on a specific date.
+In Xcode, go to `File > Add Package Dependencies`. Paste the URL of the [ExecuTorch repo](https://github.com/pytorch/executorch) into the search bar and select it. Make sure to change the branch name to the desired ExecuTorch version in format "swiftpm-<version>", (e.g. "swiftpm-1.0.0"), or a branch name in format "swiftpm-<version>.<year_month_date>" (e.g. "swiftpm-1.1.0-20251101") for a [nightly build](https://ossci-ios.s3.amazonaws.com/list.html) on a specific date.
 
 ![](_static/img/swiftpm_xcode1.png)
 
@@ -59,7 +61,7 @@ let package = Package(
   ],
   dependencies: [
     // Use "swiftpm-<version>.<year_month_day>" branch name for a nightly build.
-    .package(url: "https://github.com/pytorch/executorch.git", branch: "swiftpm-0.7.0")
+    .package(url: "https://github.com/pytorch/executorch.git", branch: "swiftpm-1.0.0")
   ],
   targets: [
     .target(
@@ -70,6 +72,10 @@ let package = Package(
         .product(name: "kernels_optimized", package: "executorch"),
         // Add other backends and kernels as needed.
       ]),
+      linkerSettings: [
+         // Force load all symbols from static libraries to trigger backends and kernels registration
+         .unsafeFlags(["-Wl,-all_load"])
+      ]
   ]
 )
 ```