Fix formatting issues in dexcore-writeup.mdx

Author: CodingRule

data/blog/dexcore-writeup.mdx

@@ -16,8 +16,8 @@ authors: ['andreicat']
 
 We are given two files:
 
-- `challenge.py` — the “encryption algorithm”
-- `dexcore.bin` — the encrypted output
+- `challenge.py` - the “encryption algorithm”
+- `dexcore.bin` - the encrypted output
 
 [GitHub](https://github.com/OmniCTF/DexCore/tree/main)
 
@@ -63,7 +63,7 @@ Finally, the script iterates every encrypted byte and *sometimes* appends the li
 - `FinalSequence.append(byte)`
 - `FinalSequence.extend(b"h4ck")`
 
-This is purely obfuscation — the marker isn’t encrypted and must be removed.
+This is purely obfuscation - the marker isn’t encrypted and must be removed.
 
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