Update cocoa SDK setup instructions (#15587)

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## DESCRIBE YOUR PR
The motivation behind this PR is to change "This is important" to "This
is *required*" in the cocoapods instructions. However I also noticed
that we recommended using cocoapods, even though cocoapods as a whole is
in maintenance mode and not recommended for iOS apps so I updated it to
recommend SPM.

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## SLA

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## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [x] Checked Vercel preview for correctness, including links
- [x] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

Author: noahsmartin

docs/platforms/apple/common/install/cocoapods.mdx

@@ -8,7 +8,7 @@ To integrate Sentry into your Xcode project using CocoaPods, specify it in your
 
 ```ruby
 platform :ios, '11.0'
-use_frameworks! # This is important
+use_frameworks! # This is required
 
 target 'YourApp' do
   pod 'Sentry', :git => 'https://github.com/getsentry/sentry-cocoa.git', :tag => '{{@inject packages.version('sentry.cocoa') }}'

docs/platforms/apple/common/install/swift-package-manager.mdx

@@ -27,9 +27,3 @@ Alternatively, when your project uses a `Package.swift` file to manage dependenc
 ```swift {tabTitle:Swift}
 .package(url: "https://github.com/getsentry/sentry-cocoa", from: "{{@inject packages.version('sentry.cocoa') }}"),
 ```
-
-<Alert>
-
-Version tags or branches need to have the Package.swift file in it or Xcode won't be able to install the package. This means versions previous to `4.4.3` _cannot_ be installed using SPM.
-
- </Alert>

docs/platforms/apple/common/tracing/instrumentation/swiftui-instrumentation.mdx

@@ -14,7 +14,7 @@ You can monitor the performance of your views in a SwiftUI project with the Sent
 
 ```ruby
 platform :ios, '13.0'
-use_frameworks! # This is important
+use_frameworks! # This is required
 
 target 'YourApp' do
   pod 'SentrySwiftUI', :git => 'https://github.com/getsentry/sentry-cocoa.git', :tag => '{{@inject packages.version('sentry.cocoa') }}'

docs/platforms/apple/guides/ios/manual-setup.mdx

@@ -10,18 +10,13 @@ If you can't (or prefer not to) run the [automatic setup](/platforms/apple/guide
 
 The minimum required version for iOS is 11.0.
 
-We recommend installing the SDK with CocoaPods, but we also support alternate [installation methods](/platforms/apple/guides/ios/install/). To integrate Sentry into your Xcode project, specify it in your `Podfile`:
+We recommend installing the SDK with SPM, but we also support alternate [installation methods](/platforms/apple/guides/ios/install/). To integrate Sentry into your Xcode project, add the package using the Github URL:
 
-```ruby {filename:Podfile}
-platform :ios, '11.0'
-use_frameworks! # This is important
-
-target 'YourApp' do
-  pod 'Sentry', :git => 'https://github.com/getsentry/sentry-cocoa.git', :tag => '{{@inject packages.version('sentry.cocoa') }}'
-end
+```
+https://github.com/getsentry/sentry-cocoa.git
 ```
 
-Then run `pod install`.
+The Package has a few products you can depend on, but the recommended one is `Sentry`. For more details see the full docs on using [Swift Package Manager](/platforms/apple/guides/ios/install/swift-package-manager).
 
 ## Configuration