Fix javadoc typo

Bug: 499934
Change-Id: I0d6ee56fad4472972f69cc1e7cb2a727e95ab6b4
Signed-off-by: Karsten Thoms <karsten.thoms@karakun.com>

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileRepositoryBuilder.java

@@ -32,7 +32,7 @@ import org.eclipse.jgit.lib.Repository;
  * <pre>
  * new FileRepositoryBuilder() //
  * 		.setGitDir(gitDirArgument) // --git-dir if supplied, no-op if null
- * 		.readEnviroment() // scan environment GIT_* variables
+ * 		.readEnvironment() // scan environment GIT_* variables
  * 		.findGitDir() // scan up the file system tree
  * 		.build()
  * </pre>