DOC: some more grammar

Co-authored-by: Adam Ginsburg <[email protected]>

Author: bsipocz

astroquery/xmatch/core.py

@@ -115,7 +115,7 @@ def query_async(self, cat1, cat2, max_distance, *, colRA1=None, colDec1=None,
         if response.status_code == 403:
             raise HTTPError("Your IP address has been banned from the XMatch server. "
                             "This means that you sent too many cross-matching jobs in "
-                            "parallel to the service blocking other astronomers. Please"
+                            "parallel to the service, blocking other astronomers. Please"
                             " contact the CDS team at cds-question[at]unistra.fr to "
                             "find a solution.")
 

docs/xmatch/xmatch.rst

@@ -84,7 +84,7 @@ Troubleshooting
 
 If you are getting a 403 Forbidden error, then your IP address has been banned from
 XMatch's server. This means that you sent too many cross-matching jobs in parallel to 
-the service blocking other astronomers. Please contact the CDS team at
+the service, blocking other astronomers. Please contact the CDS team at
 cds-question[at]unistra.fr to find a solution.
 
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