Improve javadocs - recommended by sonarcloud

Replace tag <b></b> with <strong></strong>, detected by sonarcloud:
  - https://sonarcloud.io/project/issues?id=vogellacompany_eclipse.platform.ui&open=AWjswuGBnCStnrhvQyPy&resolved=false&types=BUG
  - https://sonarcloud.io/project/issues?id=vogellacompany_eclipse.platform.ui&open=AWjswuGBnCStnrhvQyPz&resolved=false&types=BUG
  - https://sonarcloud.io/project/issues?id=vogellacompany_eclipse.platform.ui&open=AWjswuGBnCStnrhvQyP0&resolved=false&types=BUG
  - https://sonarcloud.io/project/issues?id=vogellacompany_eclipse.platform.ui&open=AWjswuGBnCStnrhvQyP1&resolved=false&types=BUG

Change-Id: Id2690e400d1db8a08aa14c7e844f946913edc971
Signed-off-by: Justin Kuenzel <java@jukusoft.com>
diff --git a/bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/package.html b/bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/package.html
index 184442f..b367014 100644
--- a/bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/package.html
+++ b/bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/package.html
@@ -11,15 +11,15 @@
 history and later be undone and redone.
 <h2>
 Package Specification</h2>
-An <b>undoable operation</b> is a unit of work that can be executed, undone, and redone.
-Operations can be added to an <b>operation history</b> so that they can later be
-undone and redone according to the undo model for an application.  Operations may be 
-assigned one or more <b>undo contexts</b> which can be used to filter the available 
+An <strong>undoable operation</strong> is a unit of work that can be executed, undone, and redone.
+Operations can be added to an <strong>operation history</strong> so that they can later be
+undone and redone according to the undo model for an application.  Operations may be
+assigned one or more <strong>undo contexts</strong> which can be used to filter the available
 operations for undo or redo in the operation history.  Clients may choose to provide
 undo and redo function for all operations in a history, or only for a particular
-undo context in that history.  Operation histories may be configured with an 
-<b>operation approver</b> so that applications can enforce any desired undo model, 
-such as strict linear (LIFO) undo.  This package provides the definition and a 
+undo context in that history.  Operation histories may be configured with an
+<strong>operation approver</strong> so that applications can enforce any desired undo model,
+such as strict linear (LIFO) undo.  This package provides the definition and a
 basic implementation for operations, undo contexts, histories, and operation
 approvers.
 </body>