Various fixes to doxygen API generation

 * Fixed incorrect file definitions
 * Fixed accidental tag problems in ecjpake.h
 * Corrected function naming in X.509 module definition
diff --git a/include/mbedtls/x509_csr.h b/include/mbedtls/x509_csr.h
index 98c75bc..34998a3 100644
--- a/include/mbedtls/x509_csr.h
+++ b/include/mbedtls/x509_csr.h
@@ -1,5 +1,5 @@
 /**
- * \file mbedtls_x509_csr.h
+ * \file x509_csr.h
  *
  * \brief X.509 certificate signing request parsing and writing
  *