Documentation for JIRA 4.3. Documentation for other versions of JIRA is available too. 
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Customisations to Velocity templates or other JIRA files are not included in the scope of Atlassian Support. In a development instance, you can play with picking up velocity file changes without a restart. Keep in mind that the next time you upgrade JIRA – or need a new installation for any reason – you will have to manually copy any changes you have made to the JSPs or tempates into the new installation of JIRA. If the JSPs or templates have changed in the newer version, you will have to port your customization into them.Deploying Velocity Templates without a Restart
From <jira-install>/atlassian-jira/WEB-INF/classes/velocity.properties: