Add a little of context about the version matrix

docs/languages/iasm.md

@@ -30,6 +30,11 @@ Or you can download the code from
 
 > *New* in ``byexample 10.1.0``.
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |

docs/languages/java.md

@@ -15,6 +15,11 @@ for `Java`. It is installed by default as part of the
 
 > *New* in ``byexample 10.3.0``.
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |

docs/languages/javascript.md

@@ -13,6 +13,11 @@ You can get the `nodejs` interpreter from [here](https://nodejs.org/en/download/
 > **Stability**: ``experimental`` - non backward compatibility changes are
 > possible or even removal between versions (even patch versions).
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |

docs/languages/powershell.md

@@ -36,6 +36,11 @@ $ byexample -l pwsh docs/languages/powershell.md    # byexample: +timeout=8
 
 > *New* in ``byexample 10.1.0``.
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |

docs/languages/python.md

@@ -23,6 +23,11 @@ If `-l python` is used in the command line, `byexample` will use the
 binary named `python` while if you use `-l python3` it will be the
 binary named `python3`.
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |

docs/languages/ruby.md

@@ -13,6 +13,11 @@ Check its [download page](https://www.ruby-lang.org/en/downloads/)
 > changes may occur between versions; but in general a change like that
 > will happen only between major versions.
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |

docs/languages/shell.md

@@ -29,6 +29,11 @@ $ byexample -l shell -o '+shell=dash' your-file-here  # byexample: +skip
 > changes may occur between versions; but in general a change like that
 > will happen only between major versions.
 
+### Versions tested
+
+We tested `byexample` with the following versions of the language
+and the underlying runner or interpreter:
+
 <!-- matrix CI begin -->
 
 | Language   | Runner/Interpreter   |