Add comment why to remove tasks

Author: sanych-sun

evergreen/evergreen.yml

@@ -2358,7 +2358,7 @@ buildvariants:
     - if: { version: "*", topology: "*", auth: "*", ssl: "*", os: "macos-14-arm64" }
       then:
         remove_tasks:
-          - test-netstandard21
+          - test-netstandard21 # Apple M1 (arm64) cannot load runtimes lower then .NET 6.
 
 - matrix_name: "secure-tests-linux-1804"
   matrix_spec: { version: ["4.2", "4.4", "5.0", "6.0"], topology: "*", auth: "auth", ssl: "ssl", os: "ubuntu-1804" }
@@ -2398,7 +2398,7 @@ buildvariants:
     - if: { version: "*", topology: "*", auth: "*", ssl: "*", os: "macos-14-arm64" }
       then:
         remove_tasks:
-          - test-netstandard21
+          - test-netstandard21 # Apple M1 (arm64) cannot load runtimes lower then .NET 6.
 
 - matrix_name: "unsecure-tests-linux-1804"
   matrix_spec: { version: ["4.2", "4.4", "5.0", "6.0"], topology: "*", auth: "noauth", ssl: "nossl", os: "ubuntu-1804" }
@@ -2438,7 +2438,7 @@ buildvariants:
     - if: { compressor : "*", auth: "*", ssl: "*", version: "*", topology: "*", os: "macos-14-arm64" }
       then:
         remove_tasks:
-          - test-netstandard21
+          - test-netstandard21 # Apple M1 (arm64) cannot load runtimes lower then .NET 6.
 
 - matrix_name: "tests-compression-linux-1804"
   matrix_spec: { compressor: "*", auth: "noauth", ssl: "nossl", version: ["4.2", "4.4", "5.0", "6.0"], topology: "standalone", os: "ubuntu-1804" }
@@ -2660,6 +2660,7 @@ buildvariants:
     - if: { os: "macos-14-arm64", ssl: "*", version: "*", topology: "*" }
       then:
         remove_tasks:
+        # Apple M1 (arm64) cannot load runtimes lower then .NET 6.
           - test-csfle-with-mocked-kms-tls-netstandard21
           - test-csfle-with-mongocryptd-netstandard21