Fix missing newline typo on ios docs (#5491)

Summary:
Pull Request resolved: #5491

Missing newline in the docs is causing "rm -rf" command to get swallowed up by markdown. This diff fix that by adding a newline.

Reviewed By: kirklandsign

Differential Revision: D63037094

fbshipit-source-id: 549c4158ed54efdf29095926c77ea77f71b92dac

Author: Riandy

examples/demo-apps/apple_ios/LLaMA/README.md

@@ -40,7 +40,8 @@ Xcode will download and cache the package on the first run, which will take some
 
 Note: If you're running into any issues related to package dependencies, quit Xcode entirely, delete the whole executorch repo, clean the caches by running the command below in terminal and clone the repo again.
 
-```rm -rf \
+```
+rm -rf \
   ~/Library/org.swift.swiftpm \
   ~/Library/Caches/org.swift.swiftpm \
   ~/Library/Caches/com.apple.dt.Xcode \

examples/demo-apps/apple_ios/LLaMA/docs/delegates/mps_README.md

@@ -80,7 +80,8 @@ Open the project in Xcode.In Xcode, go to `File > Add Package Dependencies`. Pas
 
 Note: If you're running into any issues related to package dependencies, quit Xcode entirely, delete the whole executorch repo, clean the caches by running the command below in terminal and clone the repo again.
 
-```rm -rf \
+```
+rm -rf \
   ~/Library/org.swift.swiftpm \
   ~/Library/Caches/org.swift.swiftpm \
   ~/Library/Caches/com.apple.dt.Xcode \

examples/demo-apps/apple_ios/LLaMA/docs/delegates/xnnpack_README.md

@@ -80,7 +80,8 @@ Open the project in Xcode.In Xcode, go to `File > Add Package Dependencies`. Pas
 
 Note: If you're running into any issues related to package dependencies, quit Xcode entirely, delete the whole executorch repo, clean the caches by running the command below in terminal and clone the repo again.
 
-```rm -rf \
+```
+rm -rf \
   ~/Library/org.swift.swiftpm \
   ~/Library/Caches/org.swift.swiftpm \
   ~/Library/Caches/com.apple.dt.Xcode \