minor #7318 Explain what is the Symfony Core team (javiereguiluz)

This PR was merged into the 2.7 branch.

Discussion
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Explain what is the Symfony Core team

We have an article explaining the rules that govern the Symfony Core ... but we don't explain anywhere what the Symfony Core team is.

A review from a native English speaker (@weaverryan ?) will be greatly appreciated. Thanks!

Commits
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d8f29ae Minor fixes
d2af6cc Explain what is the Symfony Core team

Author: weaverryan

contributing/code/core_team.rst

@@ -1,7 +1,15 @@
 Symfony Core Team
 =================
 
-This document states the rules that govern the Symfony Core group. These rules
+The **Symfony Core** team is the group of developers that determine the
+direction and evolution of the Symfony project. Their votes rule if the
+features and patches proposed by the community are approved or rejected.
+
+All the Symfony Core members are long-time contributors with a solid technical
+expertise and they have demonstrated a strong commitment to drive the project
+forward.
+
+This document states the rules that govern the Symfony Core team. These rules
 are effective upon publication of this document and all Symfony Core members
 must adhere to said rules and protocol.