Finish converting existing comments for internal API docs (#8146)

* Finish converting existing comments for internal API docs

99% of this was just reformatting existing comments. Only two exceptions:

- Expanded upon `BuildResult::status` compat note

- Split up file-level `symbol-table.hh` doc comments to get
  per-definition docs

Also fixed a few whitespace goofs, turning leading tabs to spaces and
removing trailing spaces.

Picking up from #8133

* Fix two things from comments

* Use triple-backtick not indent for `dumpPath`

* Convert GNU-style `\`..'` quotes to markdown style in API docs

This will render correctly.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcmd/installable-value.cc b/src/libcmd/installable-value.cc
index 30f80edb2..3a7ede4e2 100644
--- a/src/libcmd/installable-value.cc
+++ b/src/libcmd/installable-value.cc
@@ -22,7 +22,7 @@ InstallableValue::getCursor(EvalState & state)
 
 static UsageError nonValueInstallable(Installable & installable)
 {
-	return UsageError("installable '%s' does not correspond to a Nix language value", installable.what());
+    return UsageError("installable '%s' does not correspond to a Nix language value", installable.what());
 }
 
 InstallableValue & InstallableValue::require(Installable & installable)