Docs: add plugin descriptions from main readme

Also simplify constant-folding’s example
babel · Jul 9, 2016 · 4999016 · 4999016
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diff --git a/packages/babel-plugin-minify-constant-folding/README.md b/packages/babel-plugin-minify-constant-folding/README.md
@@ -1,17 +1,15 @@
 # babel-plugin-minify-constant-folding
 
+Tries to evaluate expressions and inline the result. For now only deals with numbers and strings.
+
 ## Example
 
 **In**
 
 ```javascript
 "a" + "b"
 2 * 3;
-1/3;
 4 | 3;
-a(), b();
-var x = 1;
-foo(x);
 "b" + a + "c" + "d" + g + z + "f" + "h" + "z"
 ```
 
@@ -20,11 +18,7 @@ foo(x);
 ```javascript
 "ab";
 6;
-1 / 3;
 7;
-a(), b();
-var x = 1;
-foo(x);
 "b" + a + "cd" + g + z + "fhz";
 ```
 

diff --git a/packages/babel-plugin-minify-dead-code-elimination/README.md b/packages/babel-plugin-minify-dead-code-elimination/README.md
@@ -1,5 +1,7 @@
 # babel-plugin-minify-dead-code-elimination
 
+nlines bindings when possible. Tries to evaluate expressions and prunes unreachable as a result.
+
 ## Example
 
 **In**

diff --git a/packages/babel-plugin-minify-empty-function/README.md b/packages/babel-plugin-minify-empty-function/README.md
@@ -1,5 +1,7 @@
 # babel-plugin-minify-empty-function
 
+This is mostly a Facebook-specific transform that removes noop function calls. However, can be generalized to detect and remove noops.
+
 ## Example
 
 **In**

diff --git a/packages/babel-plugin-minify-mangle-names/README.md b/packages/babel-plugin-minify-mangle-names/README.md
@@ -1,5 +1,7 @@
 # babel-plugin-minify-mangle-names
 
+Context- and scope- aware variable renaming.
+
 ## Example
 
 **In**

diff --git a/packages/babel-plugin-minify-replace/README.md b/packages/babel-plugin-minify-replace/README.md
@@ -1,6 +1,6 @@
 # babel-plugin-minify-replace
 
-Configurable "search and replace" plugin
+Configurable "search and replace" plugin. Replaces matching nodes in the tree with a given replacement node. For example you can replace `process.NODE_ENV` with `"production"`.
 
 ## Example