Fix broken links in docs (#16336)

* Fix broken links in docs

* Fix rand HSlice links

doc/docgen.rst

@@ -316,7 +316,7 @@ symbols in the `system module <system.html>`_.
 * ``proc len[T](x: seq[T]): int {.magic: "LengthSeq", noSideEffect.}`` **=>**
   `#len,seq[T] <system.html#len,seq[T]>`_
 * ``iterator pairs[T](a: seq[T]): tuple[key: int, val: T] {.inline.}`` **=>**
-  `#pairs.i,seq[T] <system.html#pairs.i,seq[T]>`_
+  `#pairs.i,seq[T] <iterators.html#pairs.i,seq[T]>`_
 * ``template newException[](exceptn: typedesc; message: string;
     parentException: ref Exception = nil): untyped`` **=>**
   `#newException.t,typedesc,string,ref.Exception

doc/manual.rst

@@ -1778,7 +1778,7 @@ dereferencing operations for reference types:
 
 Automatic dereferencing can be performed for the first argument of a routine
 call, but this is an experimental feature and is described `here
-<manual_experimental.html#type-bound-operations>`_.
+<manual_experimental.html#automatic-dereferencing>`_.
 
 In order to simplify structural type checking, recursive tuples are not valid:
 
@@ -3653,7 +3653,7 @@ Creating closures in loops
 Since closures capture local variables by reference it is often not wanted
 behavior inside loop bodies. See `closureScope
 <system.html#closureScope.t,untyped>`_ and `capture
-<sugar.html#capture.m,openArray[typed],untyped>`_ for details on how to change this behavior.
+<sugar.html#capture.m,varargs[typed],untyped>`_ for details on how to change this behavior.
 
 Anonymous Procs
 ---------------

doc/tut1.rst

@@ -1315,11 +1315,11 @@ Sequence variables are initialized with ``@[]``.
 The ``for`` statement can be used with one or two variables when used with a
 sequence. When you use the one variable form, the variable will hold the value
 provided by the sequence. The ``for`` statement is looping over the results
-from the `items() <system.html#items.i,seq[T]>`_ iterator from the `system
+from the `items() <iterators.html#items.i,seq[T]>`_ iterator from the `system
 <system.html>`_ module.  But if you use the two-variable form, the first
 variable will hold the index position and the second variable will hold the
 value. Here the ``for`` statement is looping over the results from the
-`pairs() <system.html#pairs.i,seq[T]>`_ iterator from the `system
+`pairs() <iterators.html#pairs.i,seq[T]>`_ iterator from the `system
 <system.html>`_ module.  Examples:
 
 .. code-block:: nim