Folders renamed

Improve folder names.
Correct classification of excluded test pages.

docs/tests/navigation/disambiguation/a.md

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+---
+layout: default
+title: Tests for disambiguation A
+has_children: true
+---
+
+# A
+
+A top-level page
+
+```yaml
+title: Tests for disambiguation A
+has_children: true
+```

docs/tests/navigation/disambiguation/b.md

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+---
+layout: default
+title: Tests for disambiguation B
+has_children: true
+---
+
+# B
+
+A top-level page
+
+```yaml
+title: Tests for disambiguation B
+has_children: true
+```

docs/tests/navigation/disambiguation/ca.md

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+---
+layout: default
+title: Tests for disambiguation C
+parent: Tests for disambiguation A
+has_children: true
+---
+
+# C
+
+A child of page A, and parent of page D
+
+```yaml
+title: Tests for disambiguation C
+parent: Tests for disambiguation A
+has_children: true
+```

docs/tests/navigation/disambiguation/cb.md

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+---
+layout: default
+title: Tests for disambiguation C
+parent: Tests for disambiguation B
+has_children: true
+---
+
+# C
+
+A child of page B, and parent of page D
+
+```yaml
+title: Tests for disambiguation C
+parent: Tests for disambiguation B
+has_children: true
+```

docs/tests/navigation/disambiguation/dca.md

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+---
+layout: default
+title: Tests for disambiguation D
+parent: Tests for disambiguation C
+grand_parent: Tests for disambiguation A
+---
+
+# D
+
+A grandchild of page A
+
+```yaml
+title: Tests for disambiguation D
+parent: Tests for disambiguation C
+grand_parent: Tests for disambiguation A
+```

docs/tests/navigation/disambiguation/dcb.md

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+---
+layout: default
+title: Tests for disambiguation D
+parent: Tests for disambiguation C
+grand_parent: Tests for disambiguation B
+---
+
+# D
+
+A grandchild of page B
+
+```yaml
+title: Tests for disambiguation D
+parent: Tests for disambiguation C
+grand_parent: Tests for disambiguation B
+```

docs/tests/navigation/disambiguation/index.md

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+---
+layout: default
+title: Disambiguation 
+parent: Navigation
+grand_parent: Tests
+---
+
+# Disambiguation
+
+When different pages with children have the same title, referencing the relevant grandparent in the children disambiguates which page is intended.
+
+- [Page A](a/) has a child [page with title C](ca/), and a grandchild [page with title D](dca/).
+- [Page B](b/) has a child [page with title C](cb/), and a grandchild [page with title D](dcb/).
+- The grandchild pages specify their parent and grandparent pages, so there is no ambiguity.