qgis_process: add page

[jeetjawale]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known): 3.44.7

[reinhart1010]

Suggested change

	`qgis_process run {{algorithm_id}} -- {{PARAMETER1=value1}} {{PARAMETER2=value2}}`
	`qgis_process run {{algorithm_id}} {{--PARAMETER1=value1 --PARAMETER2=value2 ...}}`

Looking at the help page itself, the -- prefix is required for each PARAMETER, not just once.

• https://docs.qgis.org/3.44/en/docs/user_manual/processing/standalone.html
• https://spatialthoughts.com/2022/07/30/qgis_process_command_line/
• https://gis.stackexchange.com/a/450090

[reinhart1010]

Suggested change

	`qgis_process --json run {{algorithm_id}} -- {{PARAMETER=value}}`
	`qgis_process --json run {{algorithm_id}} {{--PARAMETER1=value1 --PARAMETER2=value2 ...}}`

[reinhart1010]

Suggested change

	`qgis_process --skip-loading-plugins run {{algorithm_id}} -- {{PARAMETER=value}}`
	`qgis_process --skip-loading-plugins run {{algorithm_id}} {{--PARAMETER1=value1 --PARAMETER2=value2 ...}}`

[reinhart1010]

Suggested change

	`QT_QPA_PLATFORM=offscreen qgis_process run {{algorithm_id}} -- {{PARAMETER=value}}`
	`QT_QPA_PLATFORM=offscreen qgis_process run {{algorithm_id}} {{--PARAMETER1=value1 --PARAMETER2=value2 ...}}`

[jeetjawale]

Addressed all review suggestions.