Two small changes (#1157)

* Remove unwanted hard-breaks in Eigenvalues
* add `__all__` for imports in mathics.doc.common_doc

mathics/builtin/numbers/linalg.py

@@ -106,9 +106,11 @@ class Eigenvalues(Builtin):
     <dl>
       <dt>'Eigenvalues[$m$]'
       <dd>computes the eigenvalues of the matrix $m$.
-      By default Sympy's routine is used. Sometimes this is slow and
-      less good than the corresponding mpmath routine. Use option Method->"mpmath" if you want
-      to use mpmath's routine instead.
+
+      By default, Sympy's routine is used. Sometimes this is slow and \
+      less good than the corresponding mpmath routine.
+
+      Use option Method->"mpmath" if you want to use mpmath's routine instead.
     </dl>
 
     Numeric eigenvalues are sorted in order of decreasing absolute value:

mathics/doc/common_doc.py

@@ -58,3 +58,42 @@
     MathicsMainDocumentation,
     sorted_chapters,
 )
+
+__all__ = [
+    "ALLOWED_TAGS",
+    "ALLOWED_TAGS_RE",
+    "CONSOLE_RE",
+    "DL_ITEM_RE",
+    "DL_RE",
+    "DocChapter",
+    "DocGuideSection",
+    "DocPart",
+    "DocSection",
+    "DocSubsection",
+    "DocTest",
+    "DocTests",
+    "DocText",
+    "Documentation",
+    "DocumentationEntry",
+    "HYPERTEXT_RE",
+    "IMG_PNG_RE",
+    "IMG_RE",
+    "LATEX_RE",
+    "LIST_ITEM_RE",
+    "LIST_RE",
+    "MATHICS3_MODULES_TITLE",
+    "MATHICS_RE",
+    "MathicsMainDocumentation",
+    "PYTHON_RE",
+    "QUOTATIONS_RE",
+    "REF_RE",
+    "SPECIAL_COMMANDS",
+    "SUBSECTION_END_RE",
+    "SUBSECTION_RE",
+    "Tests",
+    "get_results_by_test",
+    "parse_docstring_to_DocumentationEntry_items",
+    "post_sub",
+    "pre_sub",
+    "sorted_chapters",
+]