Fix incorrect "hostname -i" command in networking.md #2083
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The lower case "-i" will return a "127.0.1.1" which is a loop back address. The address cannot be accessed from Windows side. The upper-case "-I" instead will return the outside address of the WSL instance seen by Windows.
Thus "-I" should be used instead of "-i" to get the host IP seen from WSL. There's already a note saying about this below the changed part.
This commit mainly reverts the change of PR #2033.