Fix invalid/unnecessary string escape sequences

These invalid sequences are an issue because they result in SyntaxWarnings
in Python 3.12. The one in StartPage is the one we're most interested in,
as it appears quite prominently when opening FreeCAD.

src/Ext/freecad/fc_cadquery/selectors.py

@@ -182,7 +182,7 @@ class ParallelDirSelector(BaseDirSelector):
             Linear Edges
             Planar Faces
 
-        Use the string syntax shortcut \|(X|Y|Z) if you want to select
+        Use the string syntax shortcut |(X|Y|Z) if you want to select
         based on a cardinal direction.
 
         Example::
@@ -555,7 +555,7 @@ def _getVector(self,pr):
     def filter(self,objectList):
         """
             selects minimum, maximum, positive or negative values relative to a direction
-            [+\|-\|<\|>\|] \<X\|Y\|Z>
+            [+|-|<|>|] <X|Y|Z>
         """
         return self.mySelector.filter(objectList)
 
@@ -618,7 +618,7 @@ class StringSyntaxSelector(Selector):
 
     ***Modifiers*** are ``('|','+','-','<','>','%')``
 
-        :\|:
+        :|:
             parallel to ( same as :py:class:`ParallelDirSelector` ). Can return multiple objects.
         :#:
             perpendicular to (same as :py:class:`PerpendicularDirSelector` )

src/Mod/Start/StartPage/StartPage.py

@@ -148,7 +148,7 @@ def saveIcon(key,data,ext):
     iconbank[key] = name
     return name
 
-_Re_Pattern = "<Property name=\"{}\".*?String value=\"(.*?)\"\/>"
+_Re_Pattern = "<Property name=\"{}\".*?String value=\"(.*?)\"/>"
 _Re_CreatedBy = re.compile(_Re_Pattern.format("CreatedBy"))
 _Re_Company = re.compile(_Re_Pattern.format("Company"))
 _Re_License = re.compile(_Re_Pattern.format("License"))