Update installation guide for 0.9.1 (#2230)

Author: andygrove

dev/changelog/0.9.1.md

@@ -0,0 +1,38 @@
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+
+# DataFusion Comet 0.9.1 Changelog
+
+This release consists of 2 commits from 1 contributors. See credits at the end of this changelog for more information.
+
+**Fixed bugs:**
+
+- fix: [branch-0.9] Backport FFI fix [#2164](https://github.com/apache/datafusion-comet/pull/2164) (andygrove)
+- fix: [branch-0.9] Avoid double free in CometUnifiedShuffleMemoryAllocator [#2201](https://github.com/apache/datafusion-comet/pull/2201) (andygrove)
+
+## Credits
+
+Thank you to everyone who contributed to this release. Here is a breakdown of commits (PRs merged) per contributor.
+
+```
+     2	Andy Grove
+```
+
+Thank you also to everyone who contributed in other ways such as filing issues, reviewing PRs, and providing feedback on this release.
+

docs/source/user-guide/installation.md

@@ -61,12 +61,12 @@ Cloud Service Providers.
 Comet jar files are available in [Maven Central](https://central.sonatype.com/namespace/org.apache.datafusion) for amd64 and arm64 architectures for Linux. For Apple macOS, it
 is currently necessary to build from source.
 
-Here are the direct links for downloading the Comet 0.9.0 jar file.
+Here are the direct links for downloading the Comet 0.9.1 jar file.
 
-- [Comet plugin for Spark 3.4 / Scala 2.12](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.4_2.12/0.9.0/comet-spark-spark3.4_2.12-0.9.0.jar)
-- [Comet plugin for Spark 3.4 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.4_2.13/0.9.0/comet-spark-spark3.4_2.13-0.9.0.jar)
-- [Comet plugin for Spark 3.5 / Scala 2.12](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.5_2.12/0.9.0/comet-spark-spark3.5_2.12-0.9.0.jar)
-- [Comet plugin for Spark 3.5 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.5_2.13/0.9.0/comet-spark-spark3.5_2.13-0.9.0.jar)
+- [Comet plugin for Spark 3.4 / Scala 2.12](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.4_2.12/0.9.1/comet-spark-spark3.4_2.12-0.9.1.jar)
+- [Comet plugin for Spark 3.4 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.4_2.13/0.9.1/comet-spark-spark3.4_2.13-0.9.1.jar)
+- [Comet plugin for Spark 3.5 / Scala 2.12](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.5_2.12/0.9.1/comet-spark-spark3.5_2.12-0.9.1.jar)
+- [Comet plugin for Spark 3.5 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.5_2.13/0.9.1/comet-spark-spark3.5_2.13-0.9.1.jar)
 
 ## Building from source