docs: update "CLI Installation" section in README.md (#1126)

[ut-wangbo]

Closes #1126

📑 Description

1. pass the rpm url to the rpm command.
2. remove the duplicate "-i" option in the 64 bit rpm installation command. 
3. add the "--allow-untrusted" option to apk installation command.
4. replace "curl" with "wget" for Alpine Linux.
5. remove the extra and meaningless "x" at the end of the "APK-based installation (Alpine)" section.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[ut-wangbo]

@ajayk @AlexsJones @yankay @chenrui333

thx

[AlexsJones]

but why?

[ut-wangbo]

Just try to optimize CLI installation guide. 
Ignore it if it's not necessary.

but why?

Just try to optimize CLI installation guide.  #1126
Ignore it if it's not necessary.