Fix some comments

src/Project.cpp

@@ -5199,7 +5199,7 @@ void AudacityProject::OnAudioIOStopRecording()
          /* i18n-hint:  A name given to a track, appearing as its menu button.
           The translation should be short or else it will not display well.
           At most, about 11 Latin characters.
-          Dropout is a loss of a short sequence audio sample data from the
+          Dropout is a loss of a short sequence of audio sample data from the
           recording */
          pTrack->SetName(_("Dropouts"));
          long counter = 1;

src/TrackPanelAx.cpp

@@ -352,7 +352,7 @@ wxAccStatus TrackPanelAx::GetName( int childId, wxString* name )
             *name = t->GetName();
             if( *name == t->GetDefaultName() )
             {
-               /* i18n-hint: The %d is replaced by th enumber of the track.*/
+               /* i18n-hint: The %d is replaced by the number of the track.*/
                name->Printf(_("Track %d"), TrackNum( t ) );
             }
 

src/TrackPanelCell.h

@@ -38,7 +38,7 @@ public:
    virtual ~TrackPanelNode() = 0;
 };
 
-// A node of the TrackPanel that contins other nodes.
+// A node of the TrackPanel that contains other nodes.
 class AUDACITY_DLL_API TrackPanelGroup /* not final */ : public TrackPanelNode
 {
 public:

src/WaveTrack.cpp

@@ -508,7 +508,7 @@ void WaveTrack::SetWaveColorIndex(int colorIndex)
 
 void WaveTrack::ConvertToSampleFormat(sampleFormat format)
 // WEAK-GUARANTEE
-// might complete on only some tracks
+// might complete on only some clips
 {
    for (const auto &clip : mClips)
       clip->ConvertToSampleFormat(format);