fix: CLI help for PayForBlob

[rootulp]

Closes #2990

Testing

$ ./build/celestia-appd tx blob PayForBlob --help
Pay for data blob(s) to be published to Celestia.
To publish a single blob, specify the namespaceID and blob via CLI arguments.
To publish multiple blobs, use the --input-file flag with the path to a JSON file.
The JSON should look like:

{
	"Blobs": [
		{
			"namespaceID": "0x00010203040506070809",
			"blob": "0x48656c6c6f2c20576f726c6421"
		},
		{
			"namespaceID": "0x00010203040506070809",
			"blob": "0x48656c6c6f2c20576f726c6421"
		}
	]
}

The namespaceID is the user-specifiable portion of a version 0 namespace.
The namespaceID must be a hex encoded string of 10 bytes.
The blob must be a hex encoded string of non-zero length.

Usage:
  celestia-appd tx blob PayForBlobs [namespaceID blob] [flags]

[coderabbitai]

Walkthrough

Walkthrough

The update to the payforblob.go file streamlines the help message for the PayForBlob command, enhancing readability and user guidance. The changes include cosmetic improvements such as fixing indentation and removing unnecessary characters in the help message. Additionally, the command's usability has been improved by refining the instructions for submitting blobs and adjusting the validation rules for input.

Changes

File Path	Change Summary
.../cli/payforblob.go	Updated help message formatting and instructions, removed errors import, renamed PayForBlobs to PayForBlob, and refined validation logic.

Assessment against linked issues

Objective	Addressed	Explanation
#2990: Fix indentation and remove \ns in PayForBlob --help	✅
#2990: Reword help message for clarity	✅
#2990: Ensure proper validation logic for input	✅
#2990: Rename command for consistency and clarity	✅

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[staheri14]

LGTM!