vendor: Rename IntelPlatform to AlteraPlatform.

Fixes #1179.

docs/changes.rst

@@ -102,6 +102,7 @@ Platform integration changes
 * Added: :meth:`BuildPlan.execute_local_docker`.
 * Added: :meth:`BuildPlan.extract`.
 * Added: ``build.sh``  begins with ``#!/bin/sh``.
+* Changed: ``IntelPlatform`` renamed to ``AlteraPlatform``.
 * Deprecated: argument ``run_script=`` in :meth:`BuildPlan.execute_local`.
 * Removed: (deprecated in 0.4) :mod:`vendor.intel`, :mod:`vendor.lattice_ecp5`, :mod:`vendor.lattice_ice40`, :mod:`vendor.lattice_machxo2_3l`, :mod:`vendor.quicklogic`, :mod:`vendor.xilinx`. (`RFC 18`_)
 

docs/platform.rst

@@ -10,8 +10,8 @@ Platform integration
 .. toctree::
    :maxdepth: 2
 
+   platform/altera
    platform/gowin
-   platform/intel
    platform/lattice-ecp5
    platform/lattice-ice40
    platform/lattice-machxo-2-3l

docs/platform/altera.rst

@@ -0,0 +1,10 @@
+Altera
+######
+
+.. currentmodule:: amaranth.vendor
+
+The :class:`AlteraPlatform` class provides a base platform to support Altera toolchains.
+
+The Quartus and Mistral toolchains are supported.
+
+.. autoclass:: AlteraPlatform

docs/platform/intel.rst

@@ -1,10 +0,0 @@
-Intel
-#####
-
-.. currentmodule:: amaranth.vendor
-
-The :class:`IntelPlatform` class provides a base platform to support Intel toolchains.
-
-The Quartus and Mistral toolchains are supported.
-
-.. autoclass:: IntelPlatform