modified a bit to include replace statement
it will give your the comment which is specified between that HTML tag
ALTER FUNCTION [dbo].[ufnGetProjectNotes](@ProjectID int)
RETURNS nvarchar(max)
AS
BEGIN
DECLARE @projectNotes nvarchar(max);
SELECT @projectNotes =stuff( (SELECT ','+Notes
FROM [StoreDevelopment].[dbo].[ProjectNotes] p2
WHERE p2.ProjectID = p1.ProjectID
FOR XML PATH(''), TYPE).value('.', 'nvarchar(max)')
,1,1,'')
FROM [StoreDevelopment].[dbo].[ProjectNotes] p1
GROUP BY ProjectID having projectid=@ProjectID;
projectNotes = Replace(projectNotes,'</P><P>','')
projectNotes = SUBSTR(projectNotes,3,INDEX(projectNotes,'</p')))
RETURN @projectNotes;
END