Fix markdown rendering test file

rendering_test.md

@@ -3,7 +3,8 @@
 This file tests Gitea's ability to render various Markdown elements.
 
 ## 1. Text Formatting
-*Italic*, **Bold**, ***Bold Italic***, ~~Strikethrough~~, \Inline Code
+*Italic*, **Bold**, ***Bold Italic***, ~~Strikethrough~~, `Inline Code`
+
 ## 2. Lists
 ### Unordered
 - Item 1
@@ -21,16 +22,18 @@ This file tests Gitea's ability to render various Markdown elements.
 - [ ] Incomplete task
 
 ## 3. Code Blocks
-\\python
+```python
 def hello_world():
     print('Hello, Gitea!')
-\
-\\json
+```
+
+```json
 {
-  " key\: \value\,
- \list\: [1, 2, 3]
+  "key": "value",
+  "list": [1, 2, 3]
 }
-\
+```
+
 ## 4. Tables
 | Feature | Supported | Notes |
 | :--- | :---: | ---: |
@@ -55,12 +58,14 @@ def hello_world():
 
 ## 7. Mathematical Formulas
 Display Math:
-d:\Project\GitBasedDevelopmentEnvironmentSetup \sqrt{3x-1}+(1+x)^2 d:\Project\GitBasedDevelopmentEnvironmentSetup
+$$
+\sqrt{3x-1}+(1+x)^2
+$$
 
-Inline Math: \=mc^2$
+Inline Math: $E=mc^2$
 
 ## 8. Mermaid Diagrams
-\\mermaid
+```mermaid
 sequenceDiagram
     participant Alice
     participant Bob
@@ -72,11 +77,12 @@ sequenceDiagram
     John-->>Alice: Great!
     John->>Bob: How about you?
     Bob-->>John: Jolly good!
-\
-\\mermaid
+```
+
+```mermaid
 graph TD
     A[Start] --> B{Is it working?};
     B -- Yes --> C[Great!];
     B -- No --> D[Debug];
     D --> B;
-\EOF
+```