docs: Reference chapters with doc tag

Fix some formatting.

docs/source/appendix/auxprogs.rst

@@ -11,7 +11,7 @@ yosys-config
 
 The yosys-config tool (an auto-generated shell-script) can be used to query
 compiler options and other information needed for building loadable modules for
-Yosys. See :ref:`chapter:prog` for details.
+Yosys. See :doc:`/yosys_internals/extensions` for details.
 
 .. _sec:filterlib:
 

docs/source/introduction.rst

@@ -67,7 +67,8 @@ Things you can't do
 
 - Process high-level languages such as C/C++/SystemC
 - Create physical layouts (place&route)
-  + Check out `nextpnr`_ for that
+
+  - Check out `nextpnr`_ for that
 
 .. _nextpnr: https://github.com/YosysHQ/nextpnr
 

docs/source/using_yosys/more_scripting/opt_passes.rst

@@ -37,9 +37,9 @@ The :cmd:ref:`opt_expr` pass
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 This pass performs const folding on the internal combinational cell types
-described in :ref:`chapter:celllib`. This means a cell with all constant inputs
-is replaced with the constant value this cell drives. In some cases this pass
-can also optimize cells with some constant inputs.
+described in :doc:`/yosys_internals/formats/cell_library`. This means a cell
+with all constant inputs is replaced with the constant value this cell drives.
+In some cases this pass can also optimize cells with some constant inputs.
 
 .. table:: Const folding rules for ``$_AND_`` cells as used in :cmd:ref:`opt_expr`.
    :name: tab:opt_expr_and

docs/source/yosys_internals/extensions.rst

@@ -1,5 +1,3 @@
-.. _chapter:prog:
-
 Writing extensions
 ==================
 

docs/source/yosys_internals/formats/rtlil_text.rst

@@ -223,8 +223,8 @@ Cells
 Declares a cell, with zero or more attributes, with the given identifier and
 type in the enclosing module.
 
-Cells perform functions on input signals. See :ref:`chapter:celllib` for a
-detailed list of cell types.
+Cells perform functions on input signals. See
+:doc:`/yosys_internals/formats/cell_library` for a detailed list of cell types.
 
 .. code:: BNF