[docs] fixed some small errors (#531)

docs/architecture.md

@@ -89,7 +89,7 @@ can investigate existing rules & plugins to see possible approaches.
 
 Also, in complex cases you can try to ask for help in tracker. Condition is very
 simple - it should be clear from your ticket, that you studied docs, sources,
-and tried to do something yourself. We never reject with help to real developpers.
+and tried to do something yourself. We never reject with help to real developers.
 
 
 ## Renderer
@@ -137,7 +137,7 @@ md.renderer.rules.image = function (tokens, idx, options, env, self) {
 Here is another example, how to add `target="_blank"` to all links:
 
 ```js
-// Remember old renderer, if overriden, or proxy to default renderer
+// Remember old renderer, if overridden, or proxy to default renderer
 var defaultRender = md.renderer.rules.link_open || function(tokens, idx, options, env, self) {
   return self.renderToken(tokens, idx, options);
 };

docs/development.md

@@ -38,7 +38,7 @@ Before continuing, make sure you've read:
 
 To simplify search:
 
-- add to `package.json` keyswords `markdown-it` and `markdown-it-plugin` for plugins.
+- add to `package.json` keywords `markdown-it` and `markdown-it-plugin` for plugins.
 - add keyword `markdown-it` for any other related packages.
 
 

docs/security.md

@@ -2,7 +2,7 @@
 
 Many people don't understand that markdown format does not care much about
 security. In many cases you have to pass output to sanitizers. `markdown-it`
-provides 2 possible stategies to produce safe output:
+provides 2 possible strategies to produce safe output:
 
 1. Don't enable HTML. Extend markup features with [plugins](https://www.npmjs.org/browse/keyword/markdown-it-plugin). We think it's the best choice and use it by default.
    - That's ok for 99% of user needs.