[docs] Some notes on synchronisation about m_Status

docs/Synchronisation.md

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+
+
+### srt_setsockopt(..)
+
+1. s_UDTUnited.locateSocket: m_GlobControlLock (lock, unlock)
+2. CUDT::setOpt: 
+   - Read m_bBroken, m_bClosing - no lock
+   - ScopedLock (m_ConnectionLock)
+   - ScopedLock (m_SendLock)
+   - ScopedLock (m_RecvLock)
+   - Reading m_bConnected, m_bConnecting, m_bOpened
+   - Change socket option value
+
+
+### srt_connect(..)
+
+1. s_UDTUnited.locateSocket: m_GlobControlLock (lock, unlock)
+2. CUDTUnited::connectIn(..)
+   - ScopedLock (m_ControlLock)
+   - Read, write m_Status
+   - CUDT::startConnect(..)
+     - ScopedLock (m_ConnectionLock)
+	   - m_RIDVectorLock: lock, unlock
+	   - m_bConnecting: write
+	   - if !bSynRecving return (non blocking mode)
+	   - while (!m_bClosing)
+	   
+	   
+	   
+### srt_getsockstate
+
+1. ScopedLock (m_GlobControlLock)
+   - CUDTSocket::getStatus(): no lock. Accessing CUDT::m_bConnecting, m_bConnected, m_bBroken, m_Status