There isn't currently a way to make links ignore case like this. You can get around this by using [[grammar|Grammar]] where the part before the pipe (in this case grammar) is what is displayed as the link and the part after the pipe (Grammer) is the title of the tiddler that is linked to. You can use this to put whatever text you want as the link to a tiddler. Creating something that made links ignore case automatically would probably require making a javascript plugin.
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