minor editorial updates for clarity (#941)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] Documentation Update

README.md

@@ -30,7 +30,7 @@
 
 ## 🎮 Demo
 
-Visit our demo at [https://demo.ragflow.io](https://demo.ragflow.io)
+Try our demo at [https://demo.ragflow.io](https://demo.ragflow.io).
 
 ## 📌 Latest Updates
 

docs/quickstart.md

@@ -25,6 +25,8 @@ This quick start guide describes a general process from:
 
 ## Start up the server
 
+This section provides instructions on setting up the RAGFlow server on Linux. If you are on a different operating system, no worries. Most steps are alike. 
+
 1. Ensure `vm.max_map_count` >= 262144:
 
    > To check the value of `vm.max_map_count`:
@@ -45,6 +47,7 @@ This quick start guide describes a general process from:
    > ```bash
    > vm.max_map_count=262144
    > ```
+   > See [this guide](./guides/max_map_count.md) for instructions on permanently setting `vm.max_map_count` on an operating system other than Linux. 
 
 2. Clone the repo: