Update notes for submitted changes

* Allow MINIGZIP override for default ramdisk compression tool
Update notes for submitted changes

* Fix indentation: source_recovery can be null
Update notes for submitted changes

* Enhance support for custom compression
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* Don't set MINIGZIP variable for ota scripts
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* Remove webviewchromium from bootclasspath
Update notes for submitted changes

* Make sure that OTA packages use MINIGZIP variable
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* Pass ota_custom_minigzip for Jenkins
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* releasetools: Properly handle custom values for tools (androidarmv6)
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* Delete unnecessary defines
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* Revert "Revert "Revert "Revert "ota: Make sure we don't install on top of an incompatible system""""
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* Remove Calendar & CalendarProvider
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* Revert "Remove Calendar & CalendarProvider"
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* build: armv6-vfp.mk set arch to armv6k
Update notes for submitted changes

* build: armv6-vfp.mk remove useless variables