Update docs/guides/using-bigbang/autoscaling-fluentbit-and-promtail.md,...

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Format/grammar/punctuation/acronym edits made to several pages in Guides/Using Big Bang: Installing and Configuring VPA, Credentials for Big Bang Packages, Switching between EFK and PLG, Image Pull Policy, Big Bang Applications using Kyverno, and Integrating Prometheus Label Scraping

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