fix: correct typos in CONTRIBUTING.md (hiero-ledger#1182)

Signed-off-by: Sarthak Tyagi <[email protected]>
Signed-off-by: Sarthak Tyagi <[email protected]>

Author: sarthak-cs

CONTRIBUTING.md

@@ -20,7 +20,7 @@ Thank you for your interest in contributing to the Hiero Python SDK!
 
 ### 💻 Code Contributions
 
-**Get started:** See [Steup Guide](docs/sdk_developers/setup.md)
+**Get started:** See [Setup Guide](docs/sdk_developers/setup.md)
 
 **Quick workflow:**
 1. Find/create an issue → [Issues](https://github.com/hiero-ledger/hiero-sdk-python/issues)
@@ -155,7 +155,7 @@ git rebase main -S
 
 ## Common Issues
 
-**HELP! I have a an issue...**  
+**HELP! I have an issue...**  
 No worries, we're here to help. But please first see the [Common Issues Guide](docs/common_issues.md).