another small formatting change to readme

README.md

@@ -46,7 +46,7 @@ For faster loading and improved the files are stored as [parquet files](https://
 
 For each partition there are two main file types: 
 - `_mvalues`: containing preprocessed and quality controlled DNAm M-values background corrected using [preprocessNoob](https://rdrr.io/bioc/minfi/man/preprocessNoob.html) and normalized using [BMIQ](https://rdrr.io/bioc/wateRmelon/man/BMIQ.html).
-- '_meta': metadata files containing the sample id, dataset, and UBERON tissue/cell identifiers and labels. There are two columns corresponding to UBERON identifiers, one contains the most descriptive tissue or cell term, and the second contains a more general term used to create a larger training compendium. (e.g., `pericardial fat` vs. `visceral fat`). 
+- `_meta`: metadata files containing the sample id, dataset, and UBERON tissue/cell identifiers and labels. There are two columns corresponding to UBERON identifiers, one contains the most descriptive tissue or cell term, and the second contains a more general term used to create a larger training compendium. (e.g., `pericardial fat` vs. `visceral fat`). 
 
 The full list of files include:
 - `full_ontology.edgelist`: a [networkx](https://networkx.org/documentation/stable/reference/readwrite/edgelist.html) file containing the tissue/cell ontology connecting all 86 tissue and cell terms