Add news

Author: Sparks29032

news/refactor_pdf.rst

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+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* Changed tutorial language away from PDF-specific names
+* Names of rmin, rmax, rstep renamed to xmin, xmax, xstep
+* Removed PDF-specific labels from plotting functions
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>