Correct the descriptions of SelectBackwardsLine and SelectLine (#1857)

Author: daxian-dbw

PSReadLine/PSReadLineResources.resx

@@ -373,10 +373,10 @@
     <value>Move the cursor to the end of the current token</value>
   </data>
   <data name="SelectBackwardsLineDescription" xml:space="preserve">
-    <value>Adjust the current selection to include from the cursor to the end of the line</value>
+    <value>Adjust the current selection to include from the cursor to the start of the line</value>
   </data>
   <data name="SelectLineDescription" xml:space="preserve">
-    <value>Adjust the current selection to include from the cursor to the start of the line</value>
+    <value>Adjust the current selection to include from the cursor to the end of the line</value>
   </data>
   <data name="SelectAllDescription" xml:space="preserve">
     <value>Select the entire line. Moves the cursor to the end of the line</value>