Trac #30454: some details in doc of number fields

better doc formatting, some pep cleanup, no returns, etc

also fix the problems found using
{{{
git grep ":[a-z][a-z]*:\s*\`\`" src/
}}}

URL: https://trac.sagemath.org/30454
Reported by: chapoton
Ticket author(s): Frédéric Chapoton
Reviewer(s): Thierry Monteil

Author: Release Manager

build/pkgs/configure/checksums.ini

@@ -1,4 +1,4 @@
 tarball=configure-VERSION.tar.gz
-sha1=bc02b89295bae975608586b7717f5bc6d6e6ef61
-md5=1f20546274d26f840ffd3001a077e341
-cksum=690405059
+sha1=2a934efff820d0a7fde54d3de576f7f56dc5a8e5
+md5=8defdb67a09b57e53c3992c1f4a3651f
+cksum=2892179532

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-1b9d7cff30fd43e7133ef06b53f646453e35cfa1
+b8101c8c262b01449ac12baaeae69bebcdbe04ac

src/sage/modules/torsion_quadratic_module.py

@@ -228,9 +228,9 @@ class TorsionQuadraticModule(FGP_Module_class, CachedRepresentation):
     @staticmethod
     def __classcall__(cls, V, W, gens=None, modulus=None, modulus_qf=None, check=True):
         r"""
-        Return a :class:``TorsionQuadraticModule``.
+        Return a :class:`TorsionQuadraticModule`.
 
-        This method does the preprocessing for :meth:``sage.structure.CachedRepresentation``.
+        This method does the preprocessing for :meth:`sage.structure.CachedRepresentation`.
 
         TESTS::
 

src/sage/quadratic_forms/quadratic_form.py

@@ -5,7 +5,7 @@
 
 - Jon Hanke (2007-06-19)
 - Anna Haensch (2010-07-01): Formatting and ReSTification
-- Simon Brandhorst (2019-10-15): :meth:``quadratic_form_from_invariants``
+- Simon Brandhorst (2019-10-15): :meth:`quadratic_form_from_invariants`
 """
 
 # ****************************************************************************