doc: typo Experimenetal to Experimental

CHANGELOG.md

@@ -208,7 +208,7 @@ See https://github.com/nodejs/node/labels/confirmed-bug for complete and current
 
 ### Notable changes
 
-* **buffer**: Fixed a minor errors that was causing crashes (Michaël Zasso) [#2635](https://github.com/nodejs/node/pull/2635), 
+* **buffer**: Fixed a minor errors that was causing crashes (Michaël Zasso) [#2635](https://github.com/nodejs/node/pull/2635),
 * **child_process**: Fix error that was causing crashes (Evan Lucas) [#2727](https://github.com/nodejs/node/pull/2727)
 * **crypto**: Replace use of rwlocks, unsafe on Windows XP / 2003 (Ben Noordhuis) [#2723](https://github.com/nodejs/node/pull/2723)
 * **libuv**: Upgrade from 1.7.3 to 1.7.4 (Saúl Ibarra Corretgé) [#2817](https://github.com/nodejs/node/pull/2817)
@@ -4907,7 +4907,7 @@ https://github.com/nodejs/node/commit/9cc55dca6f67a6096c858b841c677b0593404321
 
 * Upgrade V8 to 3.8.6
 * Use GYP build system on unix (Ben Noordhuis)
-* Experimenetal isolates support (Ben Noordhuis)
+* Experimental isolates support (Ben Noordhuis)
 * Improvements to Cluster API (Andreas Madsen)
 * Use isolates for internal debugger (Fedor Indutny)
 * Bug fixes