collapse docstrings by default

Author: lkdvos

docs/src/interface.md

@@ -1,3 +1,7 @@
+```@meta
+CollapsedDocStrings = true
+```
+
 # [The algorithm interface](@id sec_interface)
 
 This section starts a single, cohesive story that will weave through all documentation pages.

docs/src/logging.md

@@ -1,3 +1,7 @@
+```@meta
+CollapsedDocStrings = true
+```
+
 # [Logging](@id sec_logging)
 
 In the final part of the square‑root story we instrument the Heron iteration with logging.

docs/src/stopping_criterion.md

@@ -1,3 +1,7 @@
+```@meta
+CollapsedDocStrings = true
+```
+
 # Stopping criteria
 
 Continuing the square‑root story from the [Interface](@ref sec_interface) page, we now decide **when** the iteration should halt.