hcldec: Fix MinItems/MaxItems diagnostics messages

These were not previously consistent with the usual style.

hcldec/spec.go

@@ -410,15 +410,15 @@ func (s *BlockListSpec) decode(content *hcl.BodyContent, block *hcl.Block, ctx *
  if len(elems) < s.MinItems {
  diags = append(diags, &hcl.Diagnostic{
  Severity: hcl.DiagError,
- Summary: fmt.Sprintf("insufficient %s blocks", s.TypeName),
- Detail: fmt.Sprintf("at least %d blocks are required", s.MinItems),
+ Summary: fmt.Sprintf("Insufficient %s blocks", s.TypeName),
+ Detail: fmt.Sprintf("At least %d %q blocks are required.", s.MinItems, s.TypeName),
  Subject: &content.MissingItemRange,
  })
  } else if s.MaxItems > 0 && len(elems) > s.MaxItems {
  diags = append(diags, &hcl.Diagnostic{
  Severity: hcl.DiagError,
- Summary: fmt.Sprintf("too many %s blocks", s.TypeName),
- Detail: fmt.Sprintf("no more than %d blocks are allowed", s.MaxItems),
+ Summary: fmt.Sprintf("Too many %s blocks", s.TypeName),
+ Detail: fmt.Sprintf("No more than %d %q blocks are allowed", s.MaxItems, s.TypeName),
  Subject: &sourceRanges[s.MaxItems],
  })
  }