content: fix a few typos

Found with hunspell.

Change-Id: I5208cc9012df5f900848ef61c0ea915673efa307
Reviewed-on: https://go-review.googlesource.com/c/blog/+/247717
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/content/3years.article b/content/3years.article
index 6183691..7ac1c78 100644
--- a/content/3years.article
+++ b/content/3years.article
@@ -18,7 +18,7 @@
 
 Since the open source launch,
 we've been joined by
-[hundreds of external contributors](https://tip.golang.org/CONTRIBUTORS),
+[hundreds of external contributors](https://golang.org/CONTRIBUTORS),
 who have extended and improved Go in myriad ways,
 including writing a Windows port from scratch.
 We added a package management system
diff --git a/content/cwg.article b/content/cwg.article
index d38dbf4..0e17def 100644
--- a/content/cwg.article
+++ b/content/cwg.article
@@ -1,7 +1,7 @@
 # Community Outreach Working Group
 5 Sep 2017
 Tags: community
-Summary: Annoucing the Go Community Outreach Working Group (CWG).
+Summary: Announcing the Go Community Outreach Working Group (CWG).
 OldURL: /community-outreach-working-group
 
 Steve Francia & Cassandra Salisbury
diff --git a/content/experiment.article b/content/experiment.article
index ebe0282..286077e 100644
--- a/content/experiment.article
+++ b/content/experiment.article
@@ -1210,7 +1210,7 @@
 but we aren’t ready to shut down GOPATH just yet.
 We will keep experimenting, simplifying, and revising.
 
-We fully recgonize that
+We fully recognize that
 the Go user community
 built up almost a decade of experience
 and tooling and workflows around GOPATH,
diff --git a/content/go1.7-binary-size.article b/content/go1.7-binary-size.article
index 0b99a8d..b920d86 100644
--- a/content/go1.7-binary-size.article
+++ b/content/go1.7-binary-size.article
@@ -117,7 +117,7 @@
 unclear whether such a restricted language would be sufficiently
 useful.
 For some algorithms in the runtime we could use slower but more
-compact implementions when every kilobyte counts.
+compact implementations when every kilobyte counts.
 All of these call for more research in later development cycles.
 
 To the many contributors who helped make Go 1.7 binaries smaller,