Merge pull request #107 from jd-au/grammar-adjustments

Some minor grammar updates to assist readability

DataLink.tex

@@ -276,7 +276,7 @@ \subsubsection{Datasets linked to an astronomical source}
 object in  case of extended objects, as well as additional observations
 such as Spectra or Time Series of the source and even spectral cubes
 and Time Series of images for extended or varying objects. The \blinks\
-response obtained for the source id can allow to easily retrieve all
+response obtained for the source id can allow easy retrieval of all
 these associated data in one shot.
 
 \subsubsection{Metadata and data related to provenance entities}
@@ -688,15 +688,15 @@ \subsubsection{content\_qualifier}
 \subsubsection{local\_semantics}
 \label{sec:localSemantics}
 
-The local\_semantics column allows to identify corresponding rows for 
+The local\_semantics column allows for identification of corresponding rows for 
 different IDs in the same DataLink service where the combination of semantics, 
 content\_type and content\_qualifier is not sufficient to identify them. 
 It contains a service specific vocabulary. An example is a service delivering 
 spectral cubes derived from the same observation, with both continuum cubes 
 and line cubes. The combination of ``semantics=\#derived'', 
 ``content\_type=application/fits'' and ``content\_qualifier=cube'' 
 is insufficient to identify the various continuum or line cubes. 
-The local\_semantics column allows to provide this needed information.   
+The local\_semantics column allows this needed information to be provided.
 
 
 \subsubsection{link\_auth}