Remove developmental stage from harmonized metadata table (#163)

docs/main_text.md

@@ -53,7 +53,6 @@ Values are stripped of white space and forced to lowercase.
 | `treatment` | `treatment`, `treatment group`, `treatment protocol`,  `drug treatment`, `clinical treatment` |
 | `race` | `race`, `ethnicity`, `race/ethnicity`|
 | `subject` |  `subject `, `subject id `, `subject/sample source id `, `subject identifier `, `human subject anonymized id `, `individual `, `individual identifier `,  `individual id `, `patient `, `patient id `, `patient identifier `,  `patient number `, `patient no `,  `donor id `, `donor `, `sample_source_name `|
-| `development stage` | `developmental stage`,  `development stage`, `development stages` |
 | `compound` | `compound`, `compound1`, `compound2`, `compound name`, `drug`, `drugs`, `immunosuppressive drugs` |
 | `time` | `initial time point`, `start time`, `stop time`, `time point`, `sampling time point`, `sampling time`, `time post infection` |
 | `age` | `age`, `patient age`, `age of patient`, `age (years)`, `age at diagnosis`, `age at diagnosis years`, `characteristic [age]`, `characteristics [age]` |