gr-blocks: Standardize Vector parameter name

Addresses point 1 of Issue #4615. Replaces all label instances of "Vec
Length" to "Vector Length". Also replaces "Vec Rate" to "Vector Rate"
for standardization.

Signed-off-by: Solomon Tan <solomonbstoner@yahoo.com.au>

blocks/pad_sink.block.yml

@@ -19,7 +19,7 @@ parameters:
             sizeof(char), sizeof(char), '0', '0']
     hide: part
 -   id: vlen
-    label: Vec Length
+    label: Vector Length
     dtype: int
     default: '1'
     hide: ${ 'part' if vlen == 1 else 'none' }

blocks/pad_source.block.yml

@@ -19,7 +19,7 @@ parameters:
             sizeof(char), sizeof(char), '0', '0']
     hide: part
 -   id: vlen
-    label: Vec Length
+    label: Vector Length
     dtype: int
     default: '1'
     hide: ${ 'part' if vlen == 1 else 'none' }

tests/resources/file1.block.yml

@@ -3,13 +3,13 @@ label: testname
 
 parameters:
 -   id: vlen
-    label: Vec Length
+    label: Vector Length
     category: test
     dtype: int
     default: '1'
     hide: ${ 'part' if vlen == 1 else 'none' }
 -   id: out_type
-    label: Vec Length
+    label: Vector Length
     dtype: string
     default: complex
     hide: part