fix(doc)s: fix misencoded newline in mermaid (#1723)

Co-authored-by: danceratopz <[email protected]>

Author: howjmay

README.md

@@ -21,25 +21,25 @@ flowchart LR
   style H stroke:#F9A825,stroke-width:2px
   
   subgraph "ethereum/go-ethereum, ..."
-    C[<code>evm t8n</code>\nexternal executable]
+    C[<code>evm t8n</code><br/>external executable]
   end
 
   subgraph ethereum/solidity
-    D[<code>solc</code>\nexternal executable]
+    D[<code>solc</code><br/>external executable]
   end
 
   subgraph ethereum/EIPs
-    E(<code>EIPS/EIP-*.md</code>\nSHA digest via Github API)
+    E(<code>EIPS/EIP-*.md</code><br/>SHA digest via Github API)
   end
 
   subgraph "ethereum/execution-spec-tests"
-    A(<code>./tests/**/*.py</code>\nPython Test Cases)
-    B([<code>$ fill ./tests/</code>\nPython Framework])
+    A(<code>./tests/**/*.py</code><br/>Python Test Cases)
+    B([<code>$ fill ./tests/</code><br/>Python Framework])
   end
 
   subgraph Test Fixture Consumers
     subgraph ethereum/hive
-      G([<code>$ hive ...</code>\nGo Test Framework])
+      G([<code>$ hive ...</code><br/>Go Test Framework])
     end
     H([Client executables])
   end

docs/index.md

@@ -19,25 +19,25 @@ flowchart LR
   style H stroke:#F9A825,stroke-width:2px
   
   subgraph ethereum/go-ethereum
-    C[<code>evm t8n</code>\nexternal executable]
+    C[<code>evm t8n</code><br/>external executable]
   end
 
   subgraph ethereum/solidity
-    D[<code>solc</code>\nexternal executable]
+    D[<code>solc</code><br/>external executable]
   end
 
   subgraph ethereum/EIPs
-    E(<code>EIPS/EIP-*.md</code>\nSHA digest via Github API)
+    E(<code>EIPS/EIP-*.md</code><br/>SHA digest via Github API)
   end
 
   subgraph "ethereum/execution-spec-tests"
-    A(<code>./tests/**/*.py</code>\nPython Test Cases)
-    B([<code>$ fill ./tests/</code>\nPython Framework])
+    A(<code>./tests/**/*.py</code><br/>Python Test Cases)
+    B([<code>$ fill ./tests/</code><br/>Python Framework])
   end
 
   subgraph Test Fixture Consumers
     subgraph ethereum/hive
-      G([<code>$ hive ...</code>\nGo Test Framework])
+      G([<code>$ hive ...</code><br/>Go Test Framework])
     end
     H([Client executables])
   end

docs/writing_tests/reference_specification.md

@@ -41,7 +41,7 @@ This check accomplished by adding the following two global variables anywhere in
 | Variable Name             | Explanation                                                                                                                                                     |
 | ------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `REFERENCE_SPEC_GIT_PATH` | The relative path of the EIP markdown file in the [ethereum/EIPs](https://github.com/ethereum/EIPs/) repository, e.g. "`EIPS/eip-1234.md`"                      |
-| `REFERENCE_SPEC_VERSION`  | The SHA hash of the latest version of the file retrieved from the Github API:<br>`https://api.github.com/repos/ethereum/EIPs/contents/EIPS/eip-<EIP Number>.md` |
+| `REFERENCE_SPEC_VERSION`  | The SHA hash of the latest version of the file retrieved from the Github API:<br/>`https://api.github.com/repos/ethereum/EIPs/contents/EIPS/eip-<EIP Number>.md` |
 
 ## Running the `check_eip_versions` Command Locally