fix: technical keywords in Best Practices

Author: danieldanielecki

data/blog/software-development/web-development/frontend/javascript/slice-vs-substring-vs-substr-complete-javascript-string-methods-comparison.mdx

@@ -1068,7 +1068,7 @@ console.log(str.slice(4, 6));           // "Sc" (from index 4 to 6, exclusive)
 
 ## Best Practices
 
-### 1. Prefer slice() Over substring() and substr()
+### 1. Prefer `slice()` Over `substring()` and `substr()`
 
 ```javascript
 // ✅ GOOD: Use slice() for consistency and modern JavaScript practices
@@ -1080,7 +1080,7 @@ const usernameOld = email.substring(0, email.indexOf('@'));
 const domainOld = email.substr(email.indexOf('@') + 1);
 ```
 
-### 2. Use Negative Indices with slice() for Cleaner Code
+### 2. Use Negative Indices with `slice()` for Cleaner Code
 
 ```javascript
 // ✅ GOOD: Using negative indices with slice()