docs: fix 4 typos in CHANGELOG.md (#37549)

Docs polish — pure typo fixes, nothing under `src/`.

## Files

- `CHANGELOG.md`
  - line 1386: `appearence` → `appearance`
  - line 2117: `succesfully` → `successfully`
  - line 2301: `preceeded` → `preceded`
  - line 5593: `paramater` → `parameter`

Fixes were applied from a curated correction list, with code blocks /
inline code / URLs left alone.

CHANGELOG.md

@@ -1383,7 +1383,7 @@ been added to each release, please refer to the [blog](https://blog.gitea.com).
 

	
	
	Internal Server Error - MokoGitea
	
	
	




	
		
			
				
					
						
					
				
				
					
				
			
		
		
		
			
				
				
					500 Internal Server Error
					
					
						Gitea Version: 1.26.1+244-ga8a01ed978
						
					
				
			
		
	

	
	
		const embedded = document.querySelector('.page-content .page-content.status-page-500');
		if (embedded) {
			
			const embeddedParent = embedded.parentNode;
			let main = document.querySelector('.page-content');
			main = main ?? document.querySelector('body');
			main.prepend(document.createElement('hr'));
			main.prepend(embedded);
			embeddedParent.remove(); 
		}