Document platform support changes for Qiskit 1.1 (#1108)

In Qiskit/qiskit#12102 we're promoting the macOS arm64 environment to
tier 1 now that github actions exposes native arm64 macOS workers. This
commit updates the documentation accordingly. This should not be merged
until Qiskit 1.1.0 is released (~or 1.0.3 if we decided to backport
Qiskit/qiskit#12102~ this isn't an option because there are issues with
arm64 mac in numpy that need pretty extensive changes to workaround
which will only be in 1.1.0).

---------

Co-authored-by: Rebecca Dimock <66339736+beckykd@users.noreply.github.com>

docs/start/install.mdx

@@ -197,7 +197,8 @@ Additionally, Qiskit only supports the CPython implementation of the Python lang
 
   - Linux x86_64 (distributions compatible with the [manylinux 2014](https://www.python.org/dev/peps/pep-0599/) packaging specification).
   - macOS x86_64 (10.12 or later)
-  - Windows 64 bit
+  - macOS ARM64 (11.0 or newer)
+  - Windows 64-bit (Windows 10 and later supported)
 </details>
 
 <details>
@@ -221,9 +222,8 @@ Additionally, Qiskit only supports the CPython implementation of the Python lang
 
   - Linux ppc64le (distributions compatible with the [manylinux 2014](https://www.python.org/dev/peps/pep-0599/)packaging specification)
   - Linux s390x (distributions compatible with the [manylinux 2014](https://www.python.org/dev/peps/pep-0599/) packaging specification)
-  - macOS ARM64 (10.15 or newer)
   - Linux i686 (distributions compatible with the [manylinux 2014](https://www.python.org/dev/peps/pep-0599/) packaging specification)
-  - Windows 32 bit
+  - Windows 10 32-bit
 </details>
 
 ## Qiskit versioning