[lldb][Docs] Move QEMU testing page into the developing lldb section

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Differential Revision: https://phabricator.intern.facebook.com/D60251603

Author: DavidSpickett

lldb/docs/index.rst

@@ -125,7 +125,6 @@ interesting areas to contribute to lldb.
    use/symbolication
    use/symbols
    use/remote
-   use/qemu-testing
    use/intel_pt
    use/ondemand
    use/aarch64-linux
@@ -153,6 +152,7 @@ interesting areas to contribute to lldb.
    resources/contributing
    resources/build
    resources/test
+   resources/qemu-testing
    resources/debugging
    resources/fuzzing
    resources/sbapi