Corrected documentation typo for index :opclass.
Corrected documentation typo for index :opclass.

dennis-d/custom_sequel,dennis-d/custom_sequel,yazshel/sequel,nju520/sequel,pfarrell/sequel,mpalmer/sequel,gferguson-gd/sequel,davidbegin/sequel,beni55/sequel,uhoh-itsmaciek/sequel,Marketcircle/sequel,offshore-safety/sequel,seeARMS/sequel,nicohvi/sequel,reubano/sequel,t-morgan/sequel,offshore-safety/sequel,reubano/sequel,offshore-safety/sequel,bigfix/sequel,davidbegin/sequel,freshpay/sequel,knut2/sequel,chef/sequel,nicohvi/sequel,yazshel/sequel,beni55/sequel,freshpay/sequel,gferguson-gd/sequel,knut2/sequel,mpalmer/sequel,nju520/sequel,uhoh-itsmaciek/sequel,seeARMS/sequel,pfarrell/sequel,t-morgan/sequel