some typos

I tried to keep out personal taste.

docs/development.md

@@ -1,6 +1,6 @@
 # Development recommendations
 
-Prior to continue, make sure you've readed:
+Prior to continue, make sure you've read:
 
 1. [README](https://github.com/markdown-it/markdown-it#markdown-it)
 2. [API documentation](https://markdown-it.github.io/markdown-it/)
@@ -9,19 +9,19 @@ Prior to continue, make sure you've readed:
 
 ## General considerations for plugins.
 
-1. Try to understand, where your plugin rule sould be located.
+1. Try to understand where your plugin rule sould be located.
   - Will it conflict with existing markup (by priority)?
-    - If yes - you need to write inline or block rule.
-    - If no - you can morth tokens in core chain.
-  - Remember, that tokens morphing in core is always more simple than writing
-    block / inline rules (if you don't copy existing one). However,
+    - If yes - you need to write an inline or block rule.
+    - If no - you can morph tokens in core chain.
+  - Remember that token morphing in core is always more simple than writing
+    block / inline rules (if you don't copy existing ones). However,
     block & inline rules are usually faster.
   - Sometime it's enougth to modify renderer only (for example, to add
     header IDs or `target="_blank"` for the links).
 2. Search existing
    [plugins](https://www.npmjs.org/browse/keyword/markdown-it-plugin)
    or [rules](https://github.com/markdown-it/markdown-it/tree/master/lib),
-   doing something similar. It can me more simple to modify existing code,
+   doing something similar. It can be more simple to modify existing code,
    instead of writing all from scratch.
 3. If you did all steps above, but still has questions - ask in
    [tracker](https://github.com/markdown-it/markdown-it/issues). But, please:
@@ -52,7 +52,7 @@ can use workarounds:
 3. Render content and replace those random numbers with text
    (or replace first, then render).
 
-Or you can render html, then parse is to DOM (or
+Or you can render html, then parse it to DOM (or
 [cheerio](https://github.com/cheeriojs/cheerio) AST) and apply transformations
 in more convenient way.
 
@@ -69,17 +69,17 @@ __Note.__ Don't try to replace text with html markup! That's not secure.
 
 #### Why my inline rule is not executed?
 
-Inline parser skips peases of texts for the best speed. It stops only on [small set of chars](https://github.com/markdown-it/markdown-it/blob/master/lib/rules_inline/text.js), which can be tokens. We did not made this list extendable, also for performance reasons.
+The inline parser skips pieces of texts for the best speed. It stops only on [a small set of chars](https://github.com/markdown-it/markdown-it/blob/master/lib/rules_inline/text.js), which can be tokens. We did not made this list extendable, also for performance reasons.
 
-If you are absolutely sure, that something important is missed there - create a
+If you are absolutely sure that something important is missing there - create a
 ticket and we will consider adding new charcodes.
 
 
 #### Why do you reject some useful things?
 
-We do markdown parser. It should keep "markdown spirit". Other things should
+We do a  markdown parser. It should keep "markdown spirit". Other things should
 be kept separate (in plugins, for example). We have no clear criteria, sorry.
-Probably, you will find useful to read [CommonMark forum](http://talk.commonmark.org/) to understand us better.
+Probably, you will find [CommonMark forum](http://talk.commonmark.org/) useful to read to understand us better.
 
 Of cause, if you find architecture of this parser interesting for another type
 of markup - you are welcome to reuse it in another project.

docs/security.md

@@ -1,8 +1,8 @@
 # Security
 
-Many people don't understand, that markdown format does not care much about
+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 stategies 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.
@@ -31,5 +31,5 @@ But there is one non-evident case you should know - don't allow plugins to
 generate arbitrary element `id` and `name`. If those depend on user input -
 always add prefixes to avoid DOM clobbering. See [discussion](https://github.com/markdown-it/markdown-it/issues/28) for details.
 
-So, if you decide to use plugins, adding extended classes syntax or
-autogenerating headers anchors - be careful.
+So, if you decide to use plugins that add extended class syntax or
+autogenerating header anchors - be careful.