fix: update margin class in iExec Explorer and adjust link-url in The Graph Explorer documentation

Author: Le-Caignec

src/overview/tooling-and-explorers/iexec-explorer.md

@@ -55,7 +55,7 @@ explore apps and protectedData—all in one powerful dashboard.
 
 </CardGrid>
 
-<div class="bg-gradient-to-r from-purple-400/10 to-purple-400/5 rounded-[6px] p-6 border-l-4 border-fuchsia-700 mb-6">
+<div class="bg-gradient-to-r from-purple-400/10 to-purple-400/5 rounded-[6px] p-6 border-l-4 border-fuchsia-700 my-6">
   <h4 class="!mt-0 !mb-2">🏗️ Understanding iExec Architecture</h4>
   <p class="!mb-2"><strong>Deals</strong> are the fundamental orchestration unit - each deal coordinates a set of different stakeholders that share resources and execution parameters to execute a confidential computation task.</p>
   <p class="!mb-0">Each <strong>Deal</strong> brings together:</p>

src/overview/tooling-and-explorers/subgraph-explorer.md

@@ -104,7 +104,7 @@ explore the available data and construct complex queries.
 <ImageViewer
   image-url-dark="/assets/tooling-&-explorers/the-graph/graphql-explorer.png"
   image-alt="GraphQL Explorer Interface"
-  link-url="https://thegraph.com/explorer/subgraphs/Ep5zs5zVr4tDiVuQJepUu51e5eWYJpka624X4"
+  link-url="https://thegraph.com/explorer/subgraphs/Ep5zs5zVr4tDiVuQJepUu51e5eWYJpka624X4DMBxe3u?view=Query&chain=arbitrum-one"
 />
 
 ### How to Use the GraphQL Explorer
@@ -121,7 +121,7 @@ explore the available data and construct complex queries.
 
 Here are some example queries you can try in the GraphQL explorer:
 
-#### Query Apps on Arbitrum
+#### Query iApps
 
 ```graphql
 query {
@@ -137,7 +137,7 @@ query {
 }
 ```
 
-#### Query Protected Data on Bellecour
+#### Query Protected Data
 
 ```graphql
 query {