puppeteer: Fix typo in comments in subscriptions tests.
puppeteer: Fix typo in comments in subscriptions tests.

rht/zulip,kou/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,andersk/zulip,andersk/zulip,showell/zulip,andersk/zulip,hackerkid/zulip,brainwane/zulip,brainwane/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,showell/zulip,zulip/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,showell/zulip,zulip/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,zulip/zulip,showell/zulip,punchagan/zulip,showell/zulip,zulip/zulip,eeshangarg/zulip,brainwane/zulip,punchagan/zulip,andersk/zulip,brainwane/zulip,kou/zulip,kou/zulip,punchagan/zulip,rht/zulip,kou/zulip,hackerkid/zulip,rht/zulip,showell/zulip,rht/zulip,brainwane/zulip,brainwane/zulip,showell/zulip,rht/zulip,kou/zulip,punchagan/zulip,brainwane/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,hackerkid/zulip