docs(rtd): rename migration guides section to special topics (#2564)

so this section can be used for other things if ever needed

Author: wpbonelli

.build_rtd_docs/conf.py

@@ -101,12 +101,12 @@
 dst = os.path.join(dstdir, fpth)
 shutil.copy(src, dst)
 
-dstdir = "_migration"
+dstdir = "_misc"
 if os.path.isdir(dstdir):
     shutil.rmtree(dstdir)
 os.makedirs(dstdir)
 
-print(f"Copy migration guides to {dstdir}")
+print(f"Copy special topics to {dstdir}")
 fpth = "mf6_6_0_prt_migration_guide.md"
 src = os.path.join(fpth)
 dst = os.path.join(dstdir, fpth)

.build_rtd_docs/migration.rst

@@ -0,0 +1,10 @@
+Special Topics
+--------------
+
+This section includes miscellaneous documents, such as version-specific migration guides for particular models or capabilities.
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   _misc/mf6_6_0_prt_migration_guide

.build_rtd_docs/misc.rst

@@ -171,7 +171,7 @@ jobs:
             modflow6/.build_rtd_docs/index.rst
             modflow6/.build_rtd_docs/mf6io.rst
             modflow6/.build_rtd_docs/_dev/
-            modflow6/.build_rtd_docs/_migration/
+            modflow6/.build_rtd_docs/_misc/
             modflow6/.build_rtd_docs/_mf6io/
             modflow6/.build_rtd_docs/_mf6run/
             modflow6/.build_rtd_docs/_static/

.github/workflows/docs.yml

@@ -113,8 +113,8 @@ CMakeFiles/
 .build_rtd_docs/_mf6io
 .build_rtd_docs/_mf6src
 .build_rtd_docs/_mf6run
+.build_rtd_docs/_misc
 .build_rtd_docs/_dev
-.build_rtd_docs/_migration
 latex/
 html/
 xml/