Update docs/overview/About-HarmonyOS.rst, docs/overview/System-Security.rst,...

Update docs/overview/About-HarmonyOS.rst, docs/overview/System-Security.rst, docs/overview/Technical-Features.rst files

docs/overview/About HarmonyOS.rst → docs/overview/About-HarmonyOS.rst

@@ -62,4 +62,4 @@ This layer provides what you need to develop HarmonyOS applications: application
 Application Layer
 -----------------
 
-This layer consists of system applications and third-party applications. Each HarmonyOS application is powered by one or more Feature Abilities (FAs) or Particle Abilities (PAs). An FA provides a UI for user interaction. A PA has no UI and provides background task processing as well as data access. Applications developed based on FAs and PAs implement specific business characteristics and achieve cross-device scheduling and distribution, delighting users with consistent and efficient experience.
+This layer consists of system applications and third-party applications. Each HarmonyOS application is powered by one or more Feature Abilities (FAs) or Particle Abilities (PAs). An FA provides a UI for user interaction. A PA has no UI and provides background task processing as well as data access. Applications developed based on FAs and PAs implement specific business characteristics and achieve cross-device scheduling and distribution, delighting users with consistent and efficient experience.
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