minor symfony#9500 Fix link to Tobias' github profile (michaelcullum)

This PR was merged into the 2.7 branch.

Discussion
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Fix link to Tobias' github profile

Commits
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89fb83c Fix link to Tobias' Github profile

Author: javiereguiluz

contributing/code/core_team.rst

@@ -83,7 +83,7 @@ Active Core Members
   * **Maxime Steinhausser** (`ogizanagi`_) can merge into Config_, Console_,
     Form_, Serializer_, DependencyInjection_, and HttpKernel_ components;
 
-  * **Tobias Nyholm** (`Nyholm`) manages the official and contrib recipes
+  * **Tobias Nyholm** (`Nyholm`_) manages the official and contrib recipes
     repositories;
 
   * **Samuel Rozé** (`sroze`_) can merge into Messenger_ component.