Update embeddings description with "nomath" controls

I have added a vocabulary and GloVe embedding with all mathematics from the data discarded/ignored.

They have been used to evaluate the specific contribution of the math lexemes to statement classification models. I'm pushing all resources out before submitting a write-up for that experiment.

resources/arxmliv-embeddings-082018.md

@@ -25,7 +25,8 @@ articles, the right of distribution was only given (or assumed) to arXiv itself.
     - `glove.arxmliv.5B.300d.zip` and `vocab.arxmliv.zip`
   - 300d GloVe word embeddings for individual subsets
     - `glove.subsets.zip`
-  - Embeddings and vocabulary with math lexemes omitted: `glove.arxmliv.nomath.11B.300d.zip` and `vocab.arxmliv.nomath.zip`
+  - Embeddings and vocabulary with math lexemes omitted
+    - `glove.arxmliv.nomath.11B.300d.zip` and `vocab.arxmliv.nomath.zip`
     - added on July 20, 2019
     - used as a control when evaluating the contribution of formula lexemes
   - the main arXMLiv dataset is available separately [here](/resources/arxmliv-dataset-082018/)