Do not always capitalize error hints

[QuentinBrosse]

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Command attempted

We need to avoid the capitalization of some types or error hints. For some use-cases, it can be confusing. Here is an example of an invalid UUID: https://github.com/scaleway/scaleway-cli/issues/1532#issuecomment-727915827.

scw instance image delete b57e72c1-f394-4546-z141-78233b6

Expected Behavior

Invalid arguments 'image_id'

Details:
- 'image_id' does not respect constraints

Hint:
b57e72c1-f394-4546-z141-78233b6 is not a valid UUID. <-- The first char of the invalid UUID is in uppercase: `b`

Actual Behavior

Invalid arguments 'image_id'

Details:
- 'image_id' does not respect constraints

Hint:
B57e72c1-f394-4546-z141-78233b6 is not a valid UUID. <-- The first char of the invalid UUID is in uppercase: `B`

More info

Version    2.2.2
BuildDate  unknown
GoVersion  go1.15.3
GitBranch  unknown
GitCommit  unknown
GoArch     amd64
GoOS       darwin