fix: iOS swift code snippets have double quotes

contents/docs/experiments/adding-experiment-code.mdx

@@ -94,7 +94,7 @@ if (PostHog.getFeatureFlag("experiment-feature-flag-key")  == "variant-name") {
 
 ```ios
 // In Swift
-if (posthog.getFeatureFlag('experiment-feature-flag-key')  == 'variant-name') {
+if (posthog.getFeatureFlag("experiment-feature-flag-key") as? String == "variant-name") {
     // do something
 }
 ```

contents/docs/integrate/feature-flags-code/_snippets/feature-flags-code-ios.mdx

@@ -1,15 +1,15 @@
 ### Boolean feature flags
 
 ```swift
-if (posthog.isFeatureEnabled('flag-key')) {
+if (posthog.isFeatureEnabled("flag-key")) {
     // Do something differently for this user
 }
 ```
 
 ### Multivariate feature flags
 
 ```swift
-if (posthog.getFeatureFlag('my-flag') == "variant-key") { // replace 'variant-key' with the key of your variant
+if (posthog.getFeatureFlag("my-flag") as? String == "variant-key") { // replace "variant-key" with the key of your variant
     // do something
 }
 ```

contents/docs/libraries/ios/index.mdx

@@ -87,7 +87,7 @@ You can also manually flush the queue:
 ```
 
 ```swift
-posthog.capture('logged_out')
+posthog.capture("logged_out")
 posthog.flush()
 ```
 
@@ -154,7 +154,7 @@ if ([[PHGPosthog sharedPostHog] getFeatureFlag:@"experiment-feature-flag-key"] =
 ```
 
 ```swift
-if (posthog.getFeatureFlag('experiment-feature-flag-key')  == 'variant-name') {
+if (posthog.getFeatureFlag("experiment-feature-flag-key") as? String == "variant-name") {
     // do something
 }
 ```

contents/product-engineers/ab-testing-guide-for-engineers.md

@@ -116,7 +116,7 @@ It's absolutely **essential** to only log the users in your test who would actua
 
 To do so, ensure that checking your feature flag and logging their exposure is the *absolute* last condition you check in your code: 
 
-```
+```js
 // ❌ Incorrect. Will include unaffected users
 function showNewChanges(user) {
   if (posthog.getFeatureFlag('experiment-key') === 'control') {
@@ -133,7 +133,7 @@ function showNewChanges(user) {
 }
 ```
 
-```
+```js
 // ✅ Correct. Will exclude unaffected users
 function showNewChanges(user) {