Fix typos and wrong branch names

Author: ppkarwasz

.github/workflows/android-test.yaml

@@ -29,6 +29,6 @@ permissions: read-all
 jobs:
 
   android-test:
-    uses: apache/logging-log4j-samples/.github/workflows/android-reusable-test.yaml@feature/android-tests
+    uses: apache/logging-log4j-samples/.github/workflows/android-reusable-test.yaml@main
     with:
       log4j-version: ${{ inputs.log4j-version }}

README.adoc

@@ -25,10 +25,10 @@ xref:log4j-samples-configuration/README.adoc[`log4j-samples-configuration`]::
 Explains how to use a custom programmatic configuration.
 
 xref:log4j-samples-flume-embedded/README.adoc[`log4j-samples-flume-embedded`]::
-Explains how to use an embedded Flume agent to send logs to https://flume.apache.org[Apache Flume.]
+Explains how to use an embedded Flume agent to send logs to https://flume.apache.org[Apache Flume].
 
 xref:log4j-samples-flume-remote/README.adoc[`log4j-samples-flume-remote`]::
-Explains how to send logs to https://flume.apache.org[Apache Flume],
+Explains how to send logs to https://flume.apache.org[Apache Flume].
 
 xref:log4j-samples-graalvm/README.adoc[`log4j-samples-graalvm`]::
 Explains how to use Log4j API and its implementation to create native GraalVM images.