fix typo

Author: adrpo

CONTRIBUTING.md

@@ -43,7 +43,7 @@ All commits should adhere to the following simple guidelines (the Jenkins job ch
 
 If you need to make changes to OMCompiler-3rdParty the procedure is as follows:
 * push to a branch in OMCompiler-3rdParty (ask us for access via OpenModelica mailing list)
-* make a PR to OpenMoelica glue project with OMCompiler/3rdParty submodule pointing ar your commit from the pushed branch in OMCompiler-3rdParty
+* make a PR to OpenModelica glue project with OMCompiler/3rdParty submodule pointing ar your commit from the pushed branch in OMCompiler-3rdParty
 
 After Jenkins checks that all is OK a developer will:
 * rebase the commit from the OMCompiler-3rdParty branch to master