add missing keys: complex-key and explicit-key

Author: biojppm

src/6PBE.yaml

@@ -1,7 +1,7 @@
 ---
 - name: Zero-indented sequences in explicit mapping keys
   from: '@perlpunk'
-  tags: explicit-key mapping sequence
+  tags: explicit-key mapping sequence complex-key
   yaml: |
     ---
     ?

src/9MMW.yaml

@@ -1,7 +1,7 @@
 ---
 - name: Single Pair Implicit Entries
   from: '@perlpunk, Spec Example 7.21'
-  tags: flow mapping sequence
+  tags: flow mapping sequence complex-key
   yaml: |
     - [ YAML : separate ]
     - [ "JSON like":adjacent ]

src/KK5P.yaml

@@ -1,7 +1,7 @@
 ---
 - name: Various combinations of explicit block mappings
   from: '@perlpunk'
-  tags: explicit-key mapping sequence
+  tags: explicit-key mapping sequence complex-key
   yaml: |
     complex1:
       ? - a

src/M2N8.yaml

@@ -1,7 +1,7 @@
 ---
 - name: Question mark edge cases
   from: '@ingydotnet'
-  tags: edge empty-key
+  tags: edge empty-key complex-key explicit-key
   yaml: |
     - ? : x
   tree: |

src/RZP5.yaml

@@ -1,7 +1,7 @@
 ---
 - name: Various Trailing Comments [1.3]
   from: XW4D, modified for YAML 1.3
-  tags: anchor comment folded mapping 1.3-mod
+  tags: anchor comment folded mapping 1.3-mod complex-key explicit-key
   yaml: |
     a: "double
       quotes" # lala

src/XW4D.yaml

@@ -1,7 +1,7 @@
 ---
 - name: Various Trailing Comments
   from: '@perlpunk'
-  tags: comment explicit-key folded 1.3-err
+  tags: comment explicit-key folded 1.3-err complex-key explicit-key
   yaml: |
     a: "double
       quotes" # lala