QmlJS: Add documentation for QmlJS::Value.

Also:
* Remove unnecessary QmlJS:: qualifications in existing documentation.
* Remove unnecessary explicit links in the documentation.

Change-Id: Icb41941d98b5cfe9d2fb3b3887fafee16635eb13
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/libs/qmljs/qmljsdocument.cpp

@@ -44,15 +44,15 @@ using namespace QmlJS::AST;
 /*!
     \class QmlJS::Document
     \brief A Qml or JavaScript document.
-    \sa QmlJS::Snapshot
+    \sa Snapshot
 
-    Documents are usually created by the \l{QmlJS::ModelManagerInterface}
-    and stored in a \l{QmlJS::Snapshot}. They allow access to data such as
-    the file path, source code, abstract syntax tree and the \l{QmlJS::Bind}
+    Documents are usually created by the ModelManagerInterface
+    and stored in a Snapshot. They allow access to data such as
+    the file path, source code, abstract syntax tree and the Bind
     instance for the document.
 
     To make sure unused and outdated documents are removed correctly, Document
-    instances are usually accessed through a shared pointer, see \l{Document::Ptr}.
+    instances are usually accessed through a shared pointer, see Document::Ptr.
 
     Documents in a Snapshot are immutable: They, or anything reachable through them,
     must not be changed. This allows Documents to be shared freely among threads
@@ -62,9 +62,9 @@ using namespace QmlJS::AST;
 /*!
     \class QmlJS::LibraryInfo
     \brief A Qml library.
-    \sa QmlJS::Snapshot
+    \sa Snapshot
 
-    A LibraryInfo is created when the \l{QmlJS::ModelManagerInterface} finds
+    A LibraryInfo is created when the ModelManagerInterface finds
     a Qml library and parses the qmldir file. The instance holds information about
     which Components the library provides and which plugins to load.
 
@@ -76,12 +76,12 @@ using namespace QmlJS::AST;
 /*!
     \class QmlJS::Snapshot
     \brief A set of Document::Ptr and LibraryInfo instances.
-    \sa QmlJS::Document QmlJS::LibraryInfo
+    \sa Document LibraryInfo
 
     A Snapshot holds and offers access to a set of Document and LibraryInfo instances.
 
     Usually Snapshots are copies of the snapshot maintained and updated by the
-    \l{QmlJS::ModelManagerInterface} that updates its instance as parsing
+    ModelManagerInterface that updates its instance as parsing
     threads finish and new information becomes available.
 */