update .rst file

docs/source/mbtrack2.tracking.rst

@@ -36,6 +36,14 @@ mbtrack2.tracking.element module
    :undoc-members:
    :show-inheritance:
 
+mbtrack2.tracking.emfields module
+---------------------------------
+
+.. automodule:: mbtrack2.tracking.emfields
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 mbtrack2.tracking.excite module
 -------------------------------
 
@@ -52,6 +60,14 @@ mbtrack2.tracking.feedback module
    :undoc-members:
    :show-inheritance:
 
+mbtrack2.tracking.ibs module
+----------------------------
+
+.. automodule:: mbtrack2.tracking.ibs
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 mbtrack2.tracking.parallel module
 ---------------------------------
 
@@ -68,14 +84,6 @@ mbtrack2.tracking.particles module
    :undoc-members:
    :show-inheritance:
 
-mbtrack2.tracking.particles\_electromagnetic\_fields module
------------------------------------------------------------
-
-.. automodule:: mbtrack2.tracking.particles_electromagnetic_fields
-   :members:
-   :undoc-members:
-   :show-inheritance:
-
 mbtrack2.tracking.rf module
 ---------------------------