replace colons in docs titles

docs/user-experience/accessibility.md

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-post_title: User experience guidelines: accessibility
+post_title: User experience guidelines - accessibility
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 ## Accessibility

docs/user-experience/best-practices.md

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-post_title: User experience guidelines: best practices
+post_title: User experience guidelines - best practices
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 ## Best practices

docs/user-experience/colors.md

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-post_title: User experience guidelines: colors
+post_title: User experience guidelines - colors
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 ## Colors

docs/user-experience/notices.md

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-post_title: User experience guidelines: notices
+post_title: User experience guidelines - notices
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 ## Notices

docs/user-experience/onboarding.md

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-post_title: User experience guidelines: onboarding
+post_title: User experience guidelines - onboarding
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 ## Onboarding

docs/user-experience/task-list-and-inbox.md

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-post_title: User experience guidelines: task list and inbox
+post_title: User experience guidelines - task list and inbox
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 ## Task List & Inbox

docs/wc-cli/commands.md

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-post_title: WC CLI: commands
+post_title: WC CLI - commands
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 ## wc shop_coupon

docs/wc-cli/overview.md

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-post_title: WC CLI: overview
+post_title: WC CLI - overview
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 WooCommerce CLI (WC-CLI) offers the ability to manage WooCommerce (WC) via the command-line, using WP CLI. The documentation here covers the version of WC CLI that started shipping in WC 3.0.0 and later.