Rephrase explanation of in-plane rotations

Author: shogas

Phase & Orientation Mapping.ipynb

@@ -208,7 +208,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Define a StructureLibrary containing specifying two crystal structures and orientations of each to include. The in-plane orientations can be a list of known options, or the starting points for a search as is done here."
+    "Define a StructureLibrary containing specifying two crystal structures and orientations of each to include. The in-plane orientations can be a list of known options (set `inplane_rotations=[0]` in the call to `correlate` below) or the starting points for the list of rotations given to `correlate` below."
    ]
   },
   {
@@ -250,7 +250,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Correlate with the patterns contained in the library with the test data. At this stage the top 3 (n_largest) matching results are retained."
+    "Correlate with the patterns contained in the library with the test data. At this stage the top 3 (`n_largest`) matching results are retained. Test all in-plane rotations at 5 degree increments from 0 to 360."
    ]
   },
   {