Make minor wording change to manifesto.md

docs/manifesto.md

@@ -48,7 +48,7 @@ For the student looking for additional learning materials to supplement the badl
 
 # What we do
 SOUL aims to accelerate, experiment with, and build a stronger culture of open education at institutions of higher education, starting with MIT.
-We want to live in a world where anyone can learn anything from anywhere for free or at a low-cost.
+We want to live in a world where anyone can learn anything from anywhere for free or at a low cost.
 To that end, our main goal in the short term is to open source (e.g. via a [Creative Commons](https://creativecommons.org/about/cclicenses/) license) learning materials from as many college courses as possible in a way that makes those courses “realistically learnable”.
 By "realistically learnable", we mean that someone who meets the course's prerequisites can realistically teach themselves all of the course's content using the provided learning materials.
 
@@ -198,4 +198,4 @@ The college experience differs so much depending on where you go to college and
 OER won't be a perfect substitute for college but the ecosystem built around OER might.
 In any case, people will need many different kinds of experiences to learn all the sorts of things they want to learn.
 Some things you can't learn well in college and they are better learned through a job or some other experience.
-But there's a reason why a lot of fundamental things are taught through college courses – it's a good way to learn the material.
+But there's a reason why a lot of fundamental things are taught through college courses – it's a good way to learn the material.