modify typo in documents

Author: sinnhazime

docs/source/documents/musta.rst

@@ -19,8 +19,8 @@ It was originally developed and optimized for IsoSeq cluster or polished reads (
 
 For further information, please see `our article <https://doi.org/10.1101/2020.07.15.199851>`_.
 
-Usage
-=====
+Arguments
+=========
 
 Usage is written in `another section <usage.html>`_.
 

docs/source/documents/quick_start.md

@@ -152,7 +152,7 @@ knitr::kable(read.table("test/test_output/result/musta.salmon.tpm.txt", header =
 | PB.4.2 |  9.017369e+05|  895049.5241|  509503.73825|  9.410712e+05|
 
 You can conduct downstream analyses to investigate differentially
-expressed gene, differentially transcript usage and so on. Most of the
+expressed gene, differential transcript usage and so on. Most of the
 popular packages such as {DESeq2}, {DEXSeq}, and {SUPPA2} are available
 by setting the assembled transcriptome as reference. Some users might
 find [tappas](https://app.tappas.org/) is useful for these purposes if