DOCSP-36627: More backslash fixes

docs/reference/method/MongoDBCollection-explain.txt

@@ -29,7 +29,7 @@ Definition
 Parameters
 ----------
 
-``$explainable`` : :phpclass:`MongoDB\Operation\\Explainable`
+``$explainable`` : :phpclass:`MongoDB\Operation\Explainable`
   The command to explain.
 
 ``$options`` : array

docs/reference/method/MongoDBUpdateResult-getMatchedCount.txt

@@ -29,7 +29,7 @@ Definition
       (e.g. setting the value of a field to its current value), the matched
       count may be greater than the value returned by
       :phpmethod:`getModifiedCount()
-      <MongoDB\\UpdateResult::getModifiedCount()>`.
+      <MongoDB\UpdateResult::getModifiedCount()>`.
 
 Return Values
 -------------

docs/tutorial/tailable-cursor.txt

@@ -99,7 +99,7 @@ preceding example to use the Iterator methods directly:
    throw an exception, since all results on the cursor have been exhausted.
 
 The purpose of this example is to demonstrate the functional equivalence between
-``foreach`` and manual iteration with PHP's :php:`Iterator <iterator>`API.
+``foreach`` and manual iteration with PHP's :php:`Iterator <iterator>` API.
 For normal cursors, there is little reason to manually iterate results instead
 of a concise ``foreach`` loop.
 

docs/upgrade.txt

@@ -31,7 +31,7 @@ Type Classes
 
 When upgrading from the legacy driver, type classes such as MongoId must be
 replaced with classes in the
-`MongoDB\BSON namespace <https://php.net/manual/en/book.bson.php>`_. The
+`MongoDB\\BSON namespace <https://php.net/manual/en/book.bson.php>`_. The
 new driver also introduces interfaces for its BSON types, which should be
 preferred if applications need to type hint against BSON values.