update en/device-dev/kernel/Readme-EN.md.

Signed-off-by: NAustin <liaozhiqi7@huawei.com>

en/device-dev/kernel/Readme-EN.md

@@ -175,8 +175,7 @@
   - [Applying Patches on Development Boards](kernel-standard-patch.md)
   - [Compiling and Building the Linux Kernel](kernel-standard-build.md)
   - [Enhanced Kernel Features](kernel-standard-enhanced-features.md)
-            - [Memory Management](kernel-standard-mm.md)
-                - [Enhanced SWAP](kernel-standard-mm-eswap.md)
-            - [Task Scheduling](kernel-standard-sched.md)
-                - [Related Thread Group](kernel-standard-sched-rtg.md)
-                - [Lightweight CPU Isolation](kernel-standard-sched-cpuisolation.md)         
+    - [Enhanced SWAP](kernel-standard-mm-eswap.md)
+    - [Task Scheduling](kernel-standard-sched.md)
+      - [Related Thread Group](kernel-standard-sched-rtg.md)
+      - [Lightweight CPU Isolation](kernel-standard-sched-cpuisolation.md)         
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