[lldb] Correct style of error messages (#156774)

The LLVM Style Guide says the following about error and warning messages
[1]:

> [T]o match error message styles commonly produced by other tools,
> start the first sentence with a lowercase letter, and finish the last
> sentence without a period, if it would end in one otherwise.

I often provide this feedback during code review, but we still have a
bunch of places where we have inconsistent error message, which bothers
me as a user. This PR identifies a handful of those places and updates
the messages to be consistent.

[1] https://llvm.org/docs/CodingStandards.html#error-and-warning-messages

1 files changed, 3 insertions, 3 deletions

diff --git a/lldb/source/Commands/CommandObjectSource.cpp b/lldb/source/Commands/CommandObjectSource.cpp
index 7e7d3f0..0b4599b 100644
--- a/lldb/source/Commands/CommandObjectSource.cpp
+++ b/lldb/source/Commands/CommandObjectSource.cpp
@@ -513,7 +513,7 @@ protected:
           "No selected frame to use to find the default source.");
       return false;
     } else if (!cur_frame->HasDebugInformation()) {
-      result.AppendError("No debug info for the selected frame.");
+      result.AppendError("no debug info for the selected frame");
       return false;
     } else {
       const SymbolContext &sc =
@@ -553,11 +553,11 @@ protected:
         }
       }
       if (!m_module_list.GetSize()) {
-        result.AppendError("No modules match the input.");
+        result.AppendError("no modules match the input");
         return;
       }
     } else if (target.GetImages().GetSize() == 0) {
-      result.AppendError("The target has no associated executable images.");
+      result.AppendError("the target has no associated executable images");
       return;
     }