Apply suggestions from code review

Co-authored-by: Joe Edwards <80713360+Joseph-Edwards@users.noreply.github.com>

Author: james-d-mitchell

src/paths.cpp

@@ -594,14 +594,14 @@ This function returns the number of paths in the word graph *wg* starting at
   At worst :math:`O(nm)` where :math:`n` is the number of nodes and :math:`m`
   is the out-degree of the word graph.
 
-:note:
- If ``libsemigroups`` is compiled with the flag ``--enable-eigen``, then
- this function makes use of the `Eigen` library for linear algebra (see
- :cite:`Guennebaud2010aa`).
-
-:warning:
-  If the number of paths exceeds ``2 ** 64``, then return value of
-  this function will not be correct.
+.. note::
+    If ``libsemigroups`` is compiled with the flag ``--enable-eigen``, then
+    this function makes use of the `Eigen` library for linear algebra (see
+    :cite:`Guennebaud2010aa`).
+
+.. warning::
+    If the number of paths exceeds ``2 ** 64``, then return value of
+    this function will not be correct.
 )pbdoc");
 
     m.def(
@@ -662,16 +662,16 @@ length in a given range.
   * :any:`paths.algorithm.automatic`: attempts to select the fastest algorithm of the
     preceding algorithms and then applies that.
 
-:note:
- If ``libsemigroups`` is compiled with the flag ``--enable-eigen``, then
- this function makes use of the `Eigen` library for linear algebra (see
- :cite:`Guennebaud2010aa`).
+.. note::
+    If ``libsemigroups`` is compiled with the flag ``--enable-eigen``, then
+    this function makes use of the `Eigen` library for linear algebra (see
+    :cite:`Guennebaud2010aa`).
 
-:warning:
+.. warning::
     If the number of paths exceeds ``2 ** 64``, then return value of
     this function will not be correct.
 
-:warning:
+.. warning::
     If *lgrthm* is :any:`paths.algorithm.automatic`, then it is not
     always the case that the fastest algorithm is used.
 )pbdoc");
@@ -738,16 +738,16 @@ and ending at node *target* with length in a given range.
   * :any:`paths.algorithm.automatic`: attempts to select the fastest algorithm of the
     preceding algorithms and then applies that.
 
-:note:
- If ``libsemigroups`` is compiled with the flag ``--enable-eigen``, then
- this function makes use of the `Eigen` library for linear algebra (see
- :cite:`Guennebaud2010aa`).
+.. note::
+    If ``libsemigroups`` is compiled with the flag ``--enable-eigen``, then
+    this function makes use of the `Eigen` library for linear algebra (see
+    :cite:`Guennebaud2010aa`).
 
-:warning:
+.. warning::
     If the number of paths exceeds ``2 ** 64``, then return value of
     this function will not be correct.
 
-:warning:
+.. warning::
     If *lgrthm* is :any:`paths.algorithm.automatic`, then it is not
     always the case that the fastest algorithm is used.
 )pbdoc");