(doc) Fix GitHub Action syntax

This was reported via a Stack Overflow question here:

https://stackoverflow.com/questions/77299111/correct-way-to-use-git-version-in-a-github-action-net-core

docs/examples/github/gitreleasemanager/addasset.md

@@ -2,7 +2,7 @@
 
 ```yaml
   steps:
-  - uses: gittools/actions/gitreleasemanager/addassetv0
+  - uses: gittools/actions/gitreleasemanager/addasset@v0
     name: Add asset to a release with GitReleaseManager
     with:
       token: ${{ secrets.GITHUB_TOKEN }}

docs/examples/github/gitreleasemanager/close.md

@@ -2,7 +2,7 @@
 
 ```yaml
   steps:
-  - uses: gittools/actions/gitreleasemanager/closev0
+  - uses: gittools/actions/gitreleasemanager/close@v0
     name: Close release with GitReleaseManager
     with:
       token: ${{ secrets.GITHUB_TOKEN }}

docs/examples/github/gitreleasemanager/create.md

@@ -2,7 +2,7 @@
 
 ```yaml
   steps:
-  - uses: gittools/actions/gitreleasemanager/createv0
+  - uses: gittools/actions/gitreleasemanager/create@0
     name: Create release with GitReleaseManager
     with:
       token: ${{ secrets.GITHUB_TOKEN }}

docs/examples/github/gitreleasemanager/discard.md

@@ -2,7 +2,7 @@
 
 ```yaml
   steps:
-  - uses: gittools/actions/gitreleasemanager/discardv0
+  - uses: gittools/actions/gitreleasemanager/discard@v0
     name: Discard release with GitReleaseManager
     with:
       token: ${{ secrets.GITHUB_TOKEN }}

docs/examples/github/gitreleasemanager/open.md

@@ -2,7 +2,7 @@
 
 ```yaml
   steps:
-  - uses: gittools/actions/gitreleasemanager/openv0
+  - uses: gittools/actions/gitreleasemanager/open@v0
     name: Open release with GitReleaseManager
     with:
       token: ${{ secrets.GITHUB_TOKEN }}

docs/examples/github/gitreleasemanager/publish.md

@@ -2,7 +2,7 @@
 
 ```yaml
   steps:
-  - uses: gittools/actions/gitreleasemanager/publishv0
+  - uses: gittools/actions/gitreleasemanager/publish@v0
     name: Publish release with GitReleaseManager
     with:
       token: ${{ secrets.GITHUB_TOKEN }}