Merge pull request #2008 from zxs-un/patch-1

fix typo in doc/source/usage/tutorial/Ellipse/ellipse.ipynb

doc/source/usage/tutorial/Ellipse/ellipse.ipynb

@@ -6,14 +6,14 @@
    "source": [
     "# Extracting ellipse parmeters from rings\n",
     "\n",
-    "During a powder diffraction experiment, the scattering occures along cconcentric cones, originating from the sample position and named after 2 famous scientists: Debye and Scherrer. \n",
+    "During a powder diffraction experiment, the scattering occures along concentric cones, originating from the sample position and named after 2 famous scientists: Debye and Scherrer. \n",
     "\n",
     "![Debye-Scherrer rings](Debye-Scherrer_rings.png)\n",
     "\n",
     "Those cones are intersected by the detector and all the calibration step in pyFAI comes down is fitting the \"ring\" seen on the detector into a meaningful experimental geometry.\n",
     "\n",
     "In the most common case, a flat detector is mounted orthogonal to the incident beam and all pixel have the same size. \n",
-    "The diffraction patern is then a set of concentric cercles.\n",
+    "The diffraction patern is then a set of concentric circles.\n",
     "When the detector is still flat and all the pixels are the same but the mounting may be a bit *off*, or maybe for other technical reason one gets a set of concentric ellipses. \n",
     "This procedures explains how to extract the center coordinates, axis lengths and orientation. \n",
     "\n",