Documentation for JIRA 4.1. Documentation for other versions of JIRA is available too. 
The default Free Text Custom Field editor renders as a textarea that is 4 lines long. This may be too small for comfortable data entry and editing. The functionality that controls the behavior of that field is hardcoded in file <install directory>>atlassian-jira/WEB-INF/classes/templates/plugins/fields/edit/edit-textarea.vm. Edit all occurrences of parameter rows in the edit-textarea.vm file to the desired value and restart JIRA for the changes to take effect.
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