Change no-break spaces to regular spaces

A couple no-break spaces made their way into some source code. This
changes the NBSP characters to regular spaces.

Change-Id: I35ed5c99bd7ebef86ffee5904668cc9d8dac5c7e
diff --git a/pw_docgen/docs.rst b/pw_docgen/docs.rst
index 6ddad49..10600b2 100644
--- a/pw_docgen/docs.rst
+++ b/pw_docgen/docs.rst
@@ -148,11 +148,11 @@
   ├── conf.py
   ├── index.rst
   ├── pw_bloat
-  │   ├── bloat.rst
-  │   └── examples
-  │       └── simple_bloat.rst
+  │   ├── bloat.rst
+  │   └── examples
+  │       └── simple_bloat.rst
   ├── pw_docgen
-  │   └── docgen.rst
+  │   └── docgen.rst
   └── pw_preprocessor
       └── docs.rst
 
diff --git a/pw_kvs/key_value_store.cc b/pw_kvs/key_value_store.cc
index 32fbfc2..d0d42d1 100644
--- a/pw_kvs/key_value_store.cc
+++ b/pw_kvs/key_value_store.cc
@@ -143,7 +143,7 @@
   }
   initialized_ = true;
 
-  INF("KeyValueStore init complete: active keys %zu, deleted keys %zu, sectors "
+  INF("KeyValueStore init complete: active keys %zu, deleted keys %zu, sectors "
       "%zu, logical sector size %zu bytes",
       size(),
       (key_descriptors_.size() - size()),
diff --git a/pw_protobuf/public/pw_protobuf/encoder.h b/pw_protobuf/public/pw_protobuf/encoder.h
index ba518d9..00020a5 100644
--- a/pw_protobuf/public/pw_protobuf/encoder.h
+++ b/pw_protobuf/public/pw_protobuf/encoder.h
@@ -46,7 +46,7 @@
   Encoder(const Encoder& other) = delete;
   Encoder& operator=(const Encoder& other) = delete;
 
-  // Per the protobuf specification, valid field numbers range between 1 and
+  // Per the protobuf specification, valid field numbers range between 1 and
   // 2**29 - 1, inclusive. The numbers 19000-19999 are reserved for internal
   // use.
   constexpr static uint32_t kMaxFieldNumber = (1u << 29) - 1;