javascript: closure: fix arg name in goog.style.installStyle doc
javascript: closure: fix arg name in goog.style.installStyle doc

The argument likely used to be named ‘opt_element’ and had later
been changed to ‘opt_node’ except the text of the docstring has not
been updated.  Fix that.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=106520246

google/closure-library,redforks/closure-library,ralic/closure-library,lucidsoftware/closure-library,ikabirov/closure-library,ralic/closure-library,platinumpixs/google-closure-library,redforks/closure-library,ikabirov/closure-library,Tinkerforge/tvpl-closure-library,yathit/closure-library,Dominator008/closure-library,Medium/closure-library,ralic/closure-library,google/closure-library,Tinkerforge/tvpl-closure-library,joeltine/closure-library,lucidsoftware/closure-library,joeltine/closure-library,google/closure-library,bebbi/closure-library,codyebberson/closure-library,Tinkerforge/tvpl-closure-library,joeltine/closure-library,redforks/closure-library,yathit/closure-library,platinumpixs/google-closure-library,codyebberson/closure-library,federkasten/closure-library,nicks/closure-library,Dominator008/closure-library,teppeis/closure-library,lucidsoftware/closure-library,platinumpixs/google-closure-library,bebbi/closure-library,ikabirov/closure-library,codyebberson/closure-library,Dominator008/closure-library,nicks/closure-library,bebbi/closure-library,ChadKillingsworth/closure-library,ChadKillingsworth/closure-library,Medium/closure-library,federkasten/closure-library,nicks/closure-library,ChadKillingsworth/closure-library,teppeis/closure-library,Medium/closure-library,teppeis/closure-library,platinumpixs/google-closure-library,nicks/closure-library,lucidsoftware/closure-library,federkasten/closure-library,bebbi/closure-library,joeltine/closure-library,codyebberson/closure-library,yathit/closure-library,ChadKillingsworth/closure-library,ralic/closure-library,ikabirov/closure-library,Medium/closure-library,redforks/closure-library,Tinkerforge/tvpl-closure-library,teppeis/closure-library,yathit/closure-library,google/closure-library,google/closure-library,Dominator008/closure-library,federkasten/closure-library