Fix typos in integration docs

doc/integration/bitbucket.md

@@ -30,7 +30,7 @@ Bitbucket will generate an application ID and secret key for you to use.
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab

doc/integration/crowd.md

@@ -10,7 +10,7 @@ To enable the Crowd OmniAuth provider you must register your application with Cr
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab

doc/integration/github.md

@@ -32,7 +32,7 @@ GitHub will generate an application ID and secret key for you to use.
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab

doc/integration/gitlab.md

@@ -38,7 +38,7 @@ GitLab.com will generate an application ID and secret key for you to use.
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab

doc/integration/google.md

@@ -35,7 +35,7 @@ To enable the Google OAuth2 OmniAuth provider you must register your application
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab

doc/integration/saml.md

@@ -14,7 +14,7 @@ First configure SAML 2.0 support in GitLab, then register the GitLab application
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab

doc/integration/twitter.md

@@ -37,7 +37,7 @@ To enable the Twitter OmniAuth provider you must register your application with
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab