doc/dev: update leads list

Remove Joao Luis from the list of component leads.

Signed-off-by: Zac Dover <[email protected]>

Author: zdover23

doc/dev/developer_guide/essentials.rst

@@ -22,7 +22,6 @@ RGW       Matt Benjamin      mattbenjamin
 RBD       Ilya Dryomov       dis 
 CephFS    Venky Shankar      vshankar
 Dashboard Nizamudeen A       nizamial09 
-MON       Joao Luis          jecluis
 Build/Ops Ken Dreyer         ktdreyer
 Docs      Zac Dover          zdover23
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