Editorial: fix typo

Author: TimvdLippe

fetch.bs

@@ -7544,7 +7544,7 @@ stated otherwise, it is 0.
 <p class=note>This is called on navigation, when the source document of the navigation is the
 <a for=/>navigable</a>'s parent document. It potentially reserves either 64kb or 8kb of quota for
 the container and its navigable, if allowed by permissions policy. It is not observable to the
-cotnainer document whether the reserved quota was used in practice. This algorithm assumes that the
+container document whether the reserved quota was used in practice. This algorithm assumes that the
 container's document might delegate quota to the navigated container, and the reserved quota would
 only apply in that case, and would be ignored if it ends up being shared. If quota was reserved and
 the document ends up being <a>same origin</a> with its parent, the quota would be