docs: update iOS SDK docs for non-throwing assignment methods (#692)

Remove try keyword from getStringAssignment, getBooleanAssignment,
getIntegerAssignment, getNumericAssignment, and getJSONStringAssignment
method calls since these methods no longer throw exceptions.

Author: sameerank

docs/sdks/client-sdks/ios/assignments.mdx

@@ -40,7 +40,7 @@ getJSONStringAssignment(...)
 String assignments return a string value that is set as the variation for the experiment. String flags are the most common type of flags and are useful for both A/B/n tests and advanced targeting use cases.
 
 ```swift
-let assignment = try eppoClient.getStringAssignment(
+let assignment = eppoClient.getStringAssignment(
     flagKey: "new-user-onboarding",
     subjectKey: user.id,
     subjectAttributes: user.attributes,
@@ -63,7 +63,7 @@ default:
 Boolean flags support simple on/off toggles. They're useful for simple, binary feature switches like blue/green deployments or enabling/disabling a new feature.
 
 ```swift
-let isEnabled = try eppoClient.getBooleanAssignment(
+let isEnabled = eppoClient.getBooleanAssignment(
     flagKey: "new-feature",
     subjectKey: user.id,
     subjectAttributes: user.attributes,
@@ -83,15 +83,15 @@ The SDK supports both integer and numeric assignments. These are useful for test
 
 ```swift
 // Integer assignment
-let itemCount = try eppoClient.getIntegerAssignment(
+let itemCount = eppoClient.getIntegerAssignment(
     flagKey: "items-per-page",
     subjectKey: user.id,
     subjectAttributes: user.attributes,
     defaultValue: 10
 )
 
 // Numeric assignment
-let price = try eppoClient.getNumericAssignment(
+let price = eppoClient.getNumericAssignment(
     flagKey: "subscription-price",
     subjectKey: user.id,
     subjectAttributes: user.attributes,
@@ -112,7 +112,7 @@ let defaultConfig = """
 }
 """
 
-let config = try eppoClient.getJSONStringAssignment(
+let config = eppoClient.getJSONStringAssignment(
     flagKey: "ui-config",
     subjectKey: user.id,
     subjectAttributes: user.attributes,

docs/sdks/client-sdks/ios/quickstart.mdx

@@ -47,7 +47,7 @@ let eppoClient = EppoClient.shared()
 let userId = getCurrentUserId() // Your user identification logic
 var attributes = ["userType": "premium", "country": "US"]
 
-let isEnabled = try eppoClient.getBooleanAssignment(
+let isEnabled = eppoClient.getBooleanAssignment(
     flagKey: "new-feature",
     subjectKey: userId,
     subjectAttributes: attributes,
@@ -92,7 +92,7 @@ eppoClient = try await EppoClient.initialize(sdkKey: "<SDK-KEY>", assignmentLogg
 Then use the SDK to make experiment assignments:
 
 ```swift
-let assignment = try eppoClient.getStringAssignment(
+let assignment = eppoClient.getStringAssignment(
     flagKey: "new-user-onboarding",
     subjectKey: user.id,
     subjectAttributes: user.attributes,