Under the above link I can find: iSCSI sessions per controller or node - The recommended maximum number of iSCSI sessions that you can connect to a single controller. The general formula to calculate this is as follows: Maximum sessions = 8 * System Memory divided by 512 MB.
An the second article about licensing - enabling the iscsi license
For E-Series arrays like the E2700 there is no licensing restrictions. Note that the two documents you referenced are for FAS controllers not E-Series. Limits you may want to be aware of for the 2-port and 4-port iSCSI HICs:
Max Queue Depth per Port
Max Connections per Session
Max Target Sessions per Port (with one connection per session)
Max Target Sessions per Controller (with one connection per session)
Max Target Sessions per Port (with max connections per session)