Fixed documentation bugs
Fixed documentation bugs

Documentation of keyword was pointing to deprecated keyword. Moved
docs to use Page Should Contain Element with limit argument.

robotframework/SeleniumLibrary,emanlove/robotframework-selenium2library,emanlove/robotframework-selenium2library,rtomac/robotframework-selenium2library,robotframework/SeleniumLibrary,emanlove/robotframework-selenium2library,rtomac/robotframework-selenium2library,rtomac/robotframework-selenium2library,robotframework/SeleniumLibrary