docs: harmonize API descriptions (scaleway#3808)

Author: scaleway-bot

cmd/scw/testdata/test-all-usage-account-usage.golden

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-This API allows you to manage projects.
+This API allows you to manage your Scaleway Projects.
 
 USAGE:
   scw account <command>

cmd/scw/testdata/test-all-usage-billing-usage.golden

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-This API allows you to query your consumption.
+This API allows you to manage and query your Scaleway billing and consumption.
 
 USAGE:
   scw billing <command>

cmd/scw/testdata/test-all-usage-block-usage.golden

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-This API allows you to use and manage your Block Storage volumes.
+This API allows you to manage your Block Storage volumes.
 
 USAGE:
   scw block <command>

cmd/scw/testdata/test-all-usage-cockpit-usage.golden

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-Cockpit API.
+This API allows you to manage your Scaleway Cockpit, for storing and visualizing metrics and logs.
 
 USAGE:
   scw cockpit <command>

cmd/scw/testdata/test-all-usage-container-usage.golden

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-Container as a Service API.
+This API allows you to manage your Serverless Containers.
 
 USAGE:
   scw container <command>

cmd/scw/testdata/test-all-usage-dns-usage.golden

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-Manage your domains, DNS zones and records with the Domains and DNS API.
+This API allows you to manage your domains, DNS zones and records.
 
 USAGE:
   scw dns <command>

cmd/scw/testdata/test-all-usage-document-db-usage.golden

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-Managed Document Databases API
+This API allows you to manage your Document Databases.
 
 USAGE:
   scw document-db <command>

cmd/scw/testdata/test-all-usage-fip-usage.golden

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-Elastic Metal - Flexible IP API.
+This API allows you to manage your Elastic Metal servers' flexible public IP addresses.
 
 USAGE:
   scw fip <command>

cmd/scw/testdata/test-all-usage-iam-usage.golden

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-IAM API.
+This API allows you to manage Identity and Access Management (IAM) across your Scaleway Organizations, Projects and resources.
 
 USAGE:
   scw iam <command>

cmd/scw/testdata/test-all-usage-instance-usage.golden

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-Instance API.
+This API allows you to manage your Instances.
 
 USAGE:
   scw instance <command>