update wiki pages

Articles.md

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-sort: 17
+sort: 18
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 # Articles

BestPractices.md

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-sort: 13
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 # VM best practices 

CHANGELOG.md

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+sort: 15
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 # CHANGELOG

CaseStudies.md

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+sort: 11
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 # Case studies and talks

FAQ.md

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+sort: 14
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 # FAQ

MetricsQL.md

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+sort: 13
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 # MetricsQL

PerTenantStatistic.md

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+sort: 19
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 ## VictoriaMetrics Cluster Per Tenant Statistic

Quick-Start.md

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 # Quick Start

Release-Guide.md

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 # Release process guidance

SampleSizeCalculations.md

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 # Sample size calculations

Single-server-VictoriaMetrics.md

@@ -829,6 +829,8 @@ Optional `start` and `end` args may be added to the request in order to limit th
 unix timestamp in seconds or [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) values.
 
 The exported data can be imported to VictoriaMetrics via [/api/v1/import/native](#how-to-import-data-in-native-format).
+The native export format may change in incompatible way between VictoriaMetrics releases, so the data exported from the release X
+can fail to be imported into VictoriaMetrics release Y.
 
 
 ### How to export data in JSON line format