Fix broken external links in integration docs

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Documentation issue

The following files have broken links or redirects. Fix the links as follows:

In the file integration/jira/connect-app.md

[ ERROR ] external_links - broken reference to https://marketplace.atlassian.com/apps/1221011/gitlab-com-for-jira-cloud: link has moved permanently to 'https://marketplace.atlassian.com/apps/1221011/gitlab-com-for-jira-cloud?tab=overview'

In the file integration/salesforce.md

[ ERROR ] external_links - broken reference to https://help.salesforce.com/s/articleView?id=sf.connected_app_create.htm&type=5: link has moved permanently to 'https://help.salesforce.com/s/articleView?language=en_US&id=sf.connected_app_create.htm&type=5'