The installation instructions of a Maven package places the `url` child
of the `repository` node in an extra indentation level. This indentation
is unnecesary since both the `id` and `url` nodes are direct children of
the `repository` node.
This commit removes the unnecessary indentation.
Refs: https://codeberg.org/forgejo/forgejo/pulls/1534
(cherry picked from commit 82f0ddad7b)
(cherry picked from commit 905e546549)
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(cherry picked from commit 2f207e7deb)
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(cherry picked from commit ca8565450c)
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(cherry picked from commit ef8810c09d)
(cherry picked from commit a2d1459c4d)
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