See if we can add theta

Author: rocky

mathics/doc/common_doc.py

@@ -262,6 +262,7 @@ def repl_list(match):
             ("\u00e9", r"\'e"),
             ("\u00ea", r"\^e"),
             ("\u03b3", r"$\gamma$"),
+            ("\u03b8", r"$\theta$"),
             ("\u03bc", r"$\mu$"),
             ("\u03c0", r"$\pi$"),
             ("\u2107", r"$\mathrm{e}$"),

mathics/doc/tex/mathics.tex

@@ -61,6 +61,8 @@
     {ü}{{\"u}}1
     {ä}{{\"a}}1
     {ö}{{\"o}}1
+    {θ}{{$\theta$}}
+    {γ}{{$\gamma$}}
     {~}{{\textasciitilde}}1
     {⧦}{{===}}1
     {}{{=>}}1