docs: replace last instances of "v8" with "modular"

v8 of what? users reported this as confusing, we will use "modular"
or "namespaced" everywhere

docs/migrating-to-v22.md

@@ -7,10 +7,10 @@ next: /typescript
 
 # Switching off warning logs
 
-You may notice an influx of console warning logs as we continue deprecating all existing namespaced API. If you would like to switch these logs off, you may set the following global property to `true` anywhere before you initialize Firebase.
+You may notice a lot of console warning logs as we deprecate the existing namespaced API. If you would like to switch these logs off, you may set the following global property to `true` anywhere before you initialize Firebase.
 
 ```js
-globalThis.RNFB_SILENCE_V8_DEPRECATION_WARNINGS = true;
+globalThis.RNFB_SILENCE_MODULAR_DEPRECATION_WARNINGS = true;
 ```
 
 # Migrating to React Native modular API

packages/app/lib/common/index.js

@@ -213,7 +213,7 @@ const mapOfDeprecationReplacements = {
   },
 };
 
-const v8deprecationMessage =
+const modularDeprecationMessage =
   'This method is deprecated (as well as all React Native Firebase namespaced API) and will be removed in the next major release ' +
   'as part of move to match Firebase Web modular SDK API. Please see migration guide for more details: https://rnfirebase.io/migrating-to-v22';
 
@@ -226,7 +226,7 @@ export function deprecationConsoleWarning(nameSpace, methodName, instanceName, i
       if (instanceMap && deprecatedMethod) {
         const message = createMessage(nameSpace, methodName, instanceName);
 
-        if (!globalThis.RNFB_SILENCE_V8_DEPRECATION_WARNINGS) {
+        if (!globalThis.RNFB_SILENCE_MODULAR_DEPRECATION_WARNINGS) {
           // eslint-disable-next-line no-console
           console.warn(message);
         }
@@ -253,9 +253,9 @@ export function createMessage(
       const replacementMethodName = instance[methodName];
 
       if (replacementMethodName !== NO_REPLACEMENT) {
-        return v8deprecationMessage + ` Please use \`${replacementMethodName}\` instead.`;
+        return modularDeprecationMessage + ` Please use \`${replacementMethodName}\` instead.`;
       } else {
-        return v8deprecationMessage;
+        return modularDeprecationMessage;
       }
     }
   }
@@ -363,12 +363,12 @@ export function warnIfNotModularCall(args, replacementMethodName = '') {
     }
   }
 
-  let message = v8deprecationMessage;
+  let message = modularDeprecationMessage;
   if (replacementMethodName.length > 0) {
     message += ` Please use \`${replacementMethodName}\` instead.`;
   }
 
-  if (!globalThis.RNFB_SILENCE_V8_DEPRECATION_WARNINGS) {
+  if (!globalThis.RNFB_SILENCE_MODULAR_DEPRECATION_WARNINGS) {
     // eslint-disable-next-line no-console
     console.warn(message);
   }