Fix minor inconsistencies in the API documentation (#1663)
Fix minor inconsistencies in the API documentation (#1663)

In the jerry_set_prototype part the method was described
as jerry_get_prototype. Minor typo fix.

The usage of jerry_set_property was incorrect. Each
call to the jerry_set_property returns a value which must be freed.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com
jack60504/jerryscript,gabrielschulhof/jerryscript,bsdelf/jerryscript,zherczeg/jerryscript,jerryscript-project/jerryscript,akosthekiss/jerryscript,robertsipka/jerryscript,jack60504/jerryscript,LaszloLango/jerryscript,akosthekiss/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,glistening/jerryscript,jerryscript-project/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,akosthekiss/jerryscript,glistening/jerryscript,grgustaf/jerryscript,gabrielschulhof/jerryscript,grgustaf/jerryscript,dbatyai/jerryscript,zherczeg/jerryscript,jack60504/jerryscript,glistening/jerryscript,LaszloLango/jerryscript,gabrielschulhof/jerryscript,LaszloLango/jerryscript,zherczeg/jerryscript,dbatyai/jerryscript,martijnthe/jerryscript,jerryscript-project/jerryscript,yichoi/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,glistening/jerryscript,bsdelf/jerryscript,martijnthe/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,martijnthe/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,dbatyai/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,bsdelf/jerryscript,akosthekiss/jerryscript,bzsolt/jerryscript,martijnthe/jerryscript,grgustaf/jerryscript,robertsipka/jerryscript,glistening/jerryscript,bzsolt/jerryscript,gabrielschulhof/jerryscript,glistening/jerryscript,martijnthe/jerryscript,bsdelf/jerryscript,yichoi/jerryscript,jerryscript-project/jerryscript,bsdelf/jerryscript,jack60504/jerryscript,martijnthe/jerryscript,bsdelf/jerryscript,akosthekiss/jerryscript,dbatyai/jerryscript,zherczeg/jerryscript,jack60504/jerryscript,jerryscript-project/jerryscript,dbatyai/jerryscript,LaszloLango/jerryscript,jack60504/jerryscript,zherczeg/jerryscript,gabrielschulhof/jerryscript,robertsipka/jerryscript,LaszloLango/jerryscript