docs: Update Cosmovisor README.md (#10284)

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## Description

Changes discussed on the call with @robert-zaremba 

Closes: #XXXX

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---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

cosmovisor/README.md

@@ -30,6 +30,29 @@ To install the latest version of `cosmovisor`, run the following command:
 go install github.com/cosmos/cosmos-sdk/cosmovisor/cmd/cosmovisor@latest
 ```
 
+To install a previous version, you can specify the version. IMPORTANT: Chains that use Cosmos-SDK v0.42.x and want to use auto-download feature MUST use Cosmovisor v0.1.0
+
+```
+go install github.com/cosmos/cosmos-sdk/cosmovisor/cmd/cosmovisor@v0.1.0
+```
+
+It is possible to confirm the version of cosmovisor when using Cosmovisor v1.0.0, but it is not possible to do so with `v0.1.0`.
+
+You can also install from source by pulling the cosmos-sdk repository and switching to the correct version and building as follows:
+
+```
+git clone git@github.com:cosmos/cosmos-sdk
+cd cosmos-sdk
+git checkout cosmovisor/vx.x.x
+cd cosmovisor
+make
+```
+This will build cosmovisor in your current directory. Afterwards you may want to put it into your machine's PATH like as follows:
+
+```
+cp cosmovisor ~/go/bin/cosmovisor
+```
+
 *Note: If you are using go `v1.15` or earlier, you will need to use `go get`, and you may want to run the command outside a project directory.*
 
 ### Command Line Arguments And Environment Variables
@@ -128,6 +151,35 @@ If `DAEMON_ALLOW_DOWNLOAD_BINARIES` is set to `true`, and no local binary can be
 }
 ```
 
+You can include multiple binaries at once to ensure more than one environment will receive the correct binaries:
+
+```json
+{
+  "binaries": {
+    "linux/amd64":"https://example.com/gaia.zip?checksum=sha256:aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f",
+    "linux/arm64":"https://example.com/gaia.zip?checksum=sha256:aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f",
+    "darwin/amd64":"https://example.com/gaia.zip?checksum=sha256:aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f"
+    }
+}
+```
+
+When submitting this as a proposal ensure there are no spaces. An example command using `gaiad` could look like:
+
+```
+> gaiad tx gov submit-proposal software-upgrade Vega \
+--title Vega \
+--deposit 100uatom \
+--upgrade-height 7368420 \
+--upgrade-info '{"binaries":{"linux/amd64":"https://github.com/cosmos/gaia/releases/download/v6.0.0-rc1/gaiad-v6.0.0-rc1-linux-amd64","linux/arm64":"https://github.com/cosmos/gaia/releases/download/v6.0.0-rc1/gaiad-v6.0.0-rc1-linux-arm64","darwin/amd64":"https://github.com/cosmos/gaia/releases/download/v6.0.0-rc1/gaiad-v6.0.0-rc1-darwin-amd64"}}' \
+--description "upgrade to Vega" \
+--gas 400000 \
+--from user \
+--chain-id test \
+--home test/val2 \
+--node tcp://localhost:36657 \
+--yes
+```
+
 2. Store a link to a file that contains all information in the above format (e.g. if you want to specify lots of binaries, changelog info, etc. without filling up the blockchain). For example:
 
 ```