Fix typos

Change-Id: If41bc5e18827a5ab2d9d9c3df4fd8373ee9ac743
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/209918
Tested-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

sw/source/core/fields/ddetbl.cxx

@@ -74,7 +74,7 @@ void SwDDETable::ImplDestroy()
         }
     }
 
-    // If it is the last dependent of the "deleted field" than delete it finally
+    // If it is the last dependent of the "deleted field" then delete it finally
     if( m_pDDEType->IsDeleted() && m_pDDEType->HasOnlyOneListener() )
     {
         m_aDepends.EndListeningAll();

sw/source/core/inc/layfrm.hxx

@@ -112,7 +112,7 @@ public:
      * Method <ContainsAny()> doesn't investigate content of footnotes by default.
      * But under certain circumstances this investigation is intended.
      * Thus, introduce new optional parameter <_bInvestigateFootnoteForSections>.
-     * It's default is <false>, still indicating that content of footnotes isn't
+     * Its default is <false>, still indicating that content of footnotes isn't
      * investigated for sections.
      */
     const SwFrame *ContainsAny( const bool _bInvestigateFootnoteForSections = false ) const;

sw/source/core/layout/dumpfilter.cxx

@@ -29,7 +29,7 @@ namespace
     {
         int written = nLen;
 
-        // Actually write bytes to XOutputSream
+        // Actually write bytes to XOutputStream
         try
         {
             uno::XInterface* pObj = static_cast<uno::XInterface*>(pContext);
@@ -95,7 +95,7 @@ namespace sw
         {
             SwRootFrame* pLayout = pXDoc->GetDocShell()->GetWrtShell()->GetLayout();
 
-            // Get sure that the whole layout is processed: set a visible area
+            // Make sure that the whole layout is processed: set a visible area
             // even though there isn't any need of it
             pXDoc->GetDocShell()->GetWrtShell()->StartAction();
             tools::Rectangle aRect( 0, 0, 26000, 21000 );

sw/source/core/layout/frmtool.cxx

@@ -4041,7 +4041,7 @@ SwRect SwPageFrame::PrtWithoutHeaderAndFooter() const
     const SwFrame* pLowerFrame = Lower();
     while ( pLowerFrame )
     {
-        // Note: independent on text direction page header and page footer are
+        // Note: independent of text direction, page header and page footer are
         //       always at top respectively at bottom of the page frame.
         if ( pLowerFrame->IsHeaderFrame() )
         {
@@ -4078,7 +4078,7 @@ void GetSpacingValuesOfFrame( const SwFrame& rFrame,
     else
     {
         const SvxULSpaceItem& rULSpace = rFrame.GetAttrSet()->GetULSpace();
-        // check contextual spacing if the style of actual and next paragraphs are identical
+        // check contextual spacing if the styles of current and next paragraphs are identical
         if (bIdenticalStyles)
             onLowerSpacing = (rULSpace.GetContext() ? 0 : rULSpace.GetLower());
         else