Update release-review.adoc

- Mention PowerShell
- Add missing $releaseVersion = ...
- Add missing `$`

Author: garydgregory

src/site/antora/modules/ROOT/pages/release-review.adoc

@@ -20,12 +20,13 @@
 
 Releases of log4net can be verified with following steps:
 [#windows]
-== Windows
+== Windows (PowerShell)
 
 . Prerequisites (winget - in case of problems see next section choco)
 +
 [source,powershell]
 ----
+$releaseVersion = ...VerionToValidate...
 winget install -e --id GnuPG.Gpg4win
 winget install -e --id Slik.Subversion  # or any other subversion client
 winget install -e --id Mono.Mono
@@ -48,8 +49,8 @@ choco install dotnet-8.0-sdk
 +
 [source,powershell]
 ----
-svn co https://dist.apache.org/repos/dist/dev/logging/log4net/{releaseVersion} log4net-{releaseVersion}
-pushd log4net-{releaseVersion}
+svn co https://dist.apache.org/repos/dist/dev/logging/log4net/${releaseVersion} log4net-${releaseVersion}
+pushd log4net-${releaseVersion}
 ----
 
 . Verify and extract
@@ -147,4 +148,4 @@ docker run -it log4net-builder
 # - build src/log4net.sln
 # inside the container run
 dotnet test /logging-log4net/src/log4net.sln
-----
+----