Add various stable features

data/1.55/bound_cloned.toml

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+title = "`Bound::cloned`"
+flag = "bound_cloned"
+tracking_issue_id = 61356
+stabilization_pr_id = 86797
+doc_path = "std/ops/enum.Bound.html#method.cloned"

data/1.55/proc_macro_group_span_close.toml

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+title = "`Group::span_close`"
+flag = "proc_macro_group_span"
+tracking_issue_id = 54725
+stabilization_pr_id = 86136
+doc_path = "proc_macro/struct.Group.html#method.span_close"

data/1.55/proc_macro_group_span_open.toml

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+title = "`Group::span_open`"
+flag = "proc_macro_group_span"
+tracking_issue_id = 54725
+stabilization_pr_id = 86136
+doc_path = "proc_macro/struct.Group.html#method.span_open"

data/1.56/unsafe_cell_raw_get.toml

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+title = "`UnsafeCell::raw_get`"
+flag = "unsafe_cell_raw_get"
+tracking_issue_id = 66358
+stabilization_pr_id = 88551
+doc_path = "std/cell/struct.UnsafeCell.html#method.raw_get"

data/1.57/array_as_mut_slice.toml

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+title = "`<[T; N]>::as_mut_slice`"
+flag = "array_as_slice"
+tracking_issue_id = 76118
+stabilization_pr_id = 88353
+doc_path = "std/primitive.array.html#method.as_mut_slice"

data/1.57/array_as_slice.toml

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+title = "`<[T; N]>::as_slice`"
+flag = "array_as_slice"
+tracking_issue_id = 76118
+stabilization_pr_id = 88353
+doc_path = "std/primitive.array.html#method.as_slice"

data/1.57/iter_map_while.toml

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+title = "`Iterator::map_while`"
+flag = "iter_map_while"
+tracking_issue_id = 68537
+stabilization_pr_id = 89086
+doc_path = "std/iter/trait.Iterator.html#method.map_while"

data/1.58/char_array_pattern.toml

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+title = "`Pattern` implementation for `[char; N]`"
+impl_pr_id = 86336
+doc_path = "std/str/pattern/trait.Pattern.html#impl-Pattern%3C%27a%3E-7"

data/1.59/available_parallelism.toml

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+title = "`std::thread::available_parallelism`"
+flag = "available_parallelism"
+tracking_issue_id = 74479
+stabilization_pr_id = 92632
+doc_path = "std/thread/fn.available_parallelism.html"

data/1.59/thread_local_const_init.toml

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+title = "const-initialized thread locals"
+flag = "thread_local_const_init"
+tracking_issue_id = 84223
+stabilization_pr_id = 91355

data/unstable/termination_trait_lib.toml

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+title = "`Termination` implementation for `Result<Infallible, E>`"
+flag = "termination_trait_lib"
+impl_pr_id = 88601
+doc_path = "std/process/trait.Termination.html#impl-Termination-3"