[ios-sdk] Bump version numbers, fix headerdoc warning.

Summary:
Version numbers need to reflect 3.1 rather than 3.0.

Parameter rename in headerdoc.

Test Plan:
- Built distribution, saw 3.1

Revert Plan:

Reviewers: jacl

Reviewed By: jacl

CC: msdkexp@

Differential Revision: https://phabricator.fb.com/D582421

scripts/build_distribution.sh

@@ -91,7 +91,7 @@ $PACKAGEMAKER \
   --target 10.5 \
   --version $FB_SDK_VERSION \
   --out $FB_SDK_PKG \
-  --title 'Facebook SDK 3.0 for iOS' \
+  --title 'Facebook SDK 3.1 for iOS' \
   || die "PackageMaker reported error"
 
 # -----------------------------------------------------------------------------

scripts/build_documentation.sh

@@ -44,7 +44,7 @@ rm -rf $DOCSET
 
 hash $APPLEDOC &>/dev/null
 if [ "$?" -eq "0" ]; then
-    APPLEDOC_DOCSET_NAME="Facebook SDK 3.0 for iOS"
+    APPLEDOC_DOCSET_NAME="Facebook SDK 3.1 for iOS"
     $APPLEDOC --project-name "$APPLEDOC_DOCSET_NAME" \
 	--project-company "Facebook" \
 	--company-id "com.facebook" \

src/FBSDKVersion.h

@@ -1,2 +1,2 @@
-#define FB_IOS_SDK_VERSION_STRING @"3.0.8-6-g932f4a1"
+#define FB_IOS_SDK_VERSION_STRING @"3.1.0"
 #define FB_IOS_SDK_MIGRATION_BUNDLE @"fbsdk:20120913"

src/FBSession.h

@@ -234,7 +234,7 @@ typedef void (^FBSessionReauthorizeResultHandler)(FBSession *session,
  Following are the descriptions of the arguments along with their 
  defaults when ommitted.
  
- @param readPermissions  An array of strings representing the permissions to request during the
+ @param permissions  An array of strings representing the permissions to request during the
  authentication flow. A value of nil indicates basic permissions. The default is nil.
  @param defaultAudience  Most applications use FBSessionDefaultAudienceNone here, only specifying an audience when using reauthorize to request publish permissions.
  @param appID  The Facebook App ID for the session. If nil is passed in the default App ID will be obtained from a call to <[FBSession defaultAppID]>. The default is nil.